Well then make them also offer truth in advertising: APARTMENTS FOR RENT. RAPISTS AND MURDERERS WELCOME.
See how that sells.
How about a sign saying "Apartments for rent,tenants needed"?
When you put your stuff out for rent to the public,you have to take whatever segment of the public that shows up to rent it. Don't like that,don't become a landlord.
Besides,HOW do you YOU know that the non-convicted criminal you just rented to doesn't end up raping your dog and eating your baby? Do you have some sort of crystal ball that enables you to predict the future?
Would it be ok with you if someone put up a sign that read "Apartments for Rent,No Christians allowed"?