Robbers - literally, tearers, those who rob with violence. The temple was the place which sheltered them. It had been consecrated to God. Now that it harbors miscreants, must it not as inevitably be destroyed as a den of robbers would be by any righteous ruler?
Related Commentaries of Jeremiah 7:11
Jeremiah 7:11
11 Is this house, which is called by my name, become a den of robbers in your eyes? Behold, even I have seen it, saith the LORD.