First Temple destroyed even though they had Bitachon

 Yoma (09b) Why was the first Sanctuary destroyed? Because of three evil things which prevailed there: idolatry, immorality, bloodshed…They were wicked, but they placed their trust in G-d. For it is written, The heads thereof judge for reward, and the priests thereof teach for hire, and the prophets thereof divine for money; yet will they lean upon the Lord and say ‘Is not the Lord in the midst of us? No evil shall come upon us’.