Does having problems in you life mean you can get away with things?

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I recently wrote a post on here about whether or not having a tough life was justification for becoming a career criminal ( http://www.mylot.com/w/discussions/1099679.aspx ) but I wanted to ask another question related to it. Does having a tough life or some problems in your life justify taking advantage of your friends or generally getting into trouble (drugs, etc.)? This entire thing came to light because I was talking to an old friend of mine and telling her about a guy that used to be a mutual friend of ours. He had come out of the closet in our small hometown, and I offered him a place to stay in the city I lived in. He moved in, proceeded to fall behind on bills, offer no money for groceries and live a lifestyle that I generally didn't approve of (getting into cocaine, being promiscuous and spending money that according to him he didn't have, on big ticket items -- felt like he was rubbing it in my face). She said that she could understand his position, because just coming out of the closet, he must have been really confused, but I fail to see how being confused and scared about your sexuality justifies taking advantage of a close friend who was just trying to be supportive or leading a dangerous lifestyle. What do you guys think?