lethargic_man | Antiquities of the Jews, fit the forty-third

We have now entered into the three weeks leading up to the ninth of Av, on which date both the First Temple was destroyed by the Babylonians, and the Second Temple by the Romans. Conventionally it is explained the First Temple was destroyed as punishment for the Jews' idolatry, and the Second Temple through שנאת חינם, baseless hatred—which last didn't need G-d's intervention to lead to the Destruction of the Temple; as The Jewish War makes clear, the Romans could pretty much have stood back and let the Jews destroy themselves. Anyhow, here's why Josephus thought G-d brought the Destruction of the Temple upon the Jews (XX.8.165): (Jonathan was the High Priest.)

Now as for the affairs of the Jews, they grew worse and worse continually, for the country was again filled with robbers and impostors, who deluded the multitude. Yet did Felix catch and put to death many of those impostors every day, together with the robbers. He also caught Eleazar, the son of Dineas, who had gotten together a company of robbers; and this he did by treachery; for he gave him assurance that he should suffer no harm, and thereby persuaded him to come to him; but when he came, he bound him, and sent him to Rome. Felix also bore an ill-will to Jonathan, the high priest, because he frequently gave him admonitions about governing the Jewish affairs better than he did, lest he should himself have complaints made of him by the multitude, since he it was who had desired Caesar to send him as procurator of Judea. So Felix contrived a method whereby he might get rid of him, now he was become so continually troublesome to him; for such continual admonitions are grievous to those who are disposed to act unjustly. Wherefore Felix persuaded one of Jonathan's most faithful friends, a citizen of Jerusalem, whose name was Doras, to bring the robbers upon Jonathan, in order to kill him; and this he did by promising to give him a great deal of money for so doing. Doras complied with the proposal, and contrived matters so, that the robbers might murder him after the following manner: Certain of those robbers went up to the city, as if they were going to worship God, while they had daggers under their garments, and by thus mingling themselves among the multitude they slew Jonathan and as this murder was never avenged, the robbers went up with the greatest security at the festivals after this time; and having weapons concealed in like manner as before, and mingling themselves among the multitude, they slew certain of their own enemies, and were subservient to other men for money; and slew others, not only in remote parts of the city, but in the temple itself also; for they had the boldness to murder men there, without thinking of the impiety of which they were guilty. And this seems to me to have been the reason why God, out of his hatred of these men's wickedness, rejected our city; and as for the temple, he no longer esteemed it sufficiently pure for him to inhabit therein, but brought the Romans upon us, and threw a fire upon the city to purge it; and brought upon us, our wives, and children, slavery, as desirous to make us wiser by our calamities.

The trigger for the revolt of the Judaeans against the Romans, which led eventually to the Destruction, was a clash between the Jewish and Greek ("Syrian") residents of Caesarea. The seeds of this clash were sown a little while in advance (XX.8.163):

And now it was that a great sedition arose between the Jews that inhabited Caesarea, and the Syrians who dwelt there also, concerning their equal right to the privileges belonging to citizens; for the Jews claimed the pre-eminence, because Herod their king was the builder of Cesarea, and because he was by birth a Jew. Now the Syrians did not deny what was alleged about Herod; but they said that Caesarea was formerly called Strato's Tower, and that then there was not one Jewish inhabitant. When the presidents of that country heard of these disorders, they caught the authors of them on both sides, and tormented them with stripes, and by that means put a stop to the disturbance for a time. But the Jewish citizens depending on their wealth, and on that account despising the Syrians, reproached them again, and hoped to provoke them by such reproaches. However, the Syrians, though they were inferior in wealth, yet valuing themselves highly on this account, that the greatest part of the Roman soldiers that were there were either of Caesarea or Sebaste, they also for some time used reproachful language to the Jews also; and thus it was, till at length they came to throwing stones at one another, and several were wounded, and fell on both sides, though still the Jews were the conquerors. But when Felix saw that this quarrel was become a kind of war, he came upon them on the sudden, and desired the Jews to desist; and when they refused so to do, he armed his soldiers, and sent them out upon them, and slew many of them, and took more of them alive, and permitted his soldiers to plunder some of the houses of the citizens, which were full of riches. Now those Jews that were more moderate, and of principal dignity among them, were afraid of themselves, and desired of Felix that he would sound a retreat to his soldiers, and spare them for the future, and afford them room for repentance for what they had done; and Felix was prevailed upon to do so.

[...]

Two of the principal Syrians in Caesarea persuaded Burrhus, who was Nero's tutor, and secretary for his Greek epistles, by giving him a great sum of money, to disannul that equality of the Jewish privileges of citizens which they hitherto enjoyed. So Burrhus, by his solicitations, obtained leave of the emperor that an epistle should be written to that purpose. This epistle became the occasion of the following miseries that befell our nation; for when the Jews of Caesarea were informed of the contents of this epistle to the Syrians, they were more disorderly than before, till a war was kindled.

[Please comment at my collected Book XX notes post, on Dreamwidth for preference, or on LiveJournal.]

Josephus notes Jewish learning notes index