Don't invite thieves to your house? You say you let people who you trust play on your PS3, so what's the problem? If you know them, they won't take your ps3 to a pawn show unless they're some drug addicts.
"How do you prove that you exist...? Maybe we don't exist..."
Yes it is, a more pressing issue. I should have mentioned that it is the issue. Or part of it anyways. The times I've been "robbed", I woke up or came home to find that another resident of y home had taken and sold my games, and other items. I'm not a violent person but its happened to often for me to be calm about it the next time. So to prevent any of my inner demons from escaping I'd like to prevent my stuff from being stolen in the first place.
Ok..... I see where the problem is....
STOP BRINGING PEOPLE TO YOUR HOME.
Since you say this isn't the first time this has happened, this is 100% your own fault, and you need to change that.
Seems like you let people walk all over you man.... not cool. Nut up and take out the riff-raff.