Do you want Destiny to have friendly fire?
I do. I prefer my game with a certain level of realism. I'm not one that goes through and team kills, but it bugs me when I see things like a stray rocket hit a team member and it has no affect on them.
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I say yes because of the realism. Destiny is a big place and you should have no problem going somewhere else if someone is just doing it to be annoying.