Man, good question! I've been thinking about this lately too!
Personally, I'd try it. Why not? I've always wondered what the taste would be like.
I don't really think there is anything wrong with canibalism, in the sense I'm talking about. If you're out looking to eat people then yeah, obviously there is something wrong with that..
Though I do believe there are some detremental physical aspects of it, if you eat enough of it. I forget the name of the disease, but there are certain things you become more at risk of if you practice cannibalism...
No doubt I'd eat a person to survive, that question is easy!
I think it would be really wierd to know the person your actually eating though, like if your buddy was going to get his leg amputated I'd opt out of trying that sample. Something about knowing the person who you are eating is a little strange..