I'm with you, I only report people who are going overboard or those who AFK or legit go out of their way to ruin a game.
If your friend is indeed innocent, I'm sorry, but 90% of the people who come to the forums and complain that they have been wrongly banned can be see from thread creation or one or two replies that they most likely were banned for a reason. You see it all the time, "I'm wrongly banned, the fuck Rito get off your lazy asses and fix this shit" and I just roll my eyes, or if someone questions them they respond with "No, you idiot, I didn't do X or Y, I'm a perfect person."
Like, it's hard to sympathize with anyone who comes here complaining about a ban when you see this in at least half the threads.