I would have investigated to see if there were any reports of children being brought into the home for his criminal activities. If yes, I wouldn't have bought it, unless I had enough money to burn it down.
If it was merely a walls a roof, I may have considered it, but, as a male, probably not. If the address is linked to the pedo, I wouldn't be attaching myself to it.
Not judging at all, merely answering.
Clearly, you've done an amazing job, and you have given, and continue to give more goodness under that roof to outweigh the bad.
The smudge and prayers were very wise decisions.