@LiberalLibrarian It has been my overwhelming experience that the people who preach loudest and hardest about some sin or other is likely to be a person with overwhelming urges and desires to commit that very sin. That or they're trying to erase the very sin they've already committed by preaching against it.
I think they preach against them so loudly not to call out others, but to try to suppress the desires within.
("I can't be evil, look how loudly I'm against this sin!!!")