I understand but aren't we to be blame for this? We took their home, we took their shelter and what can they do? And they don't have enough wisdom to know who they should harm and who they shouldn't.

And many of monkey i know here are too friendly but yea after they starts to live with humans they learn to hoodwink people because many thieves are known to use monkey to snatch valuables from tourist by providing bananas as incentives to them.