What other party was in the accident? He CHOSE not to report it, it's not a freaking hit and run.

You make a really, really bad keyboard lawyer. I don't particularly agree with the guy getting off with no legal implications at all, but that's up to him. If the guy isn't a chronic DUI, I bet this will serve as a real good wake-up call.
I don't know where you're getting the idea that this is "profit". There is no profit here, he's getting money to replace what was damaged, which he bought and paid taxes on, with money that he paid taxes on. Insurance settlements aren't taxed, for exactly this reason. If I make $20,000 at work, pay taxes on it, go out and buy a bike, and then have to replace that bike, why would I pay taxes on the money I get to replace it? I'm no richer than I was before, unless I choose not to replace it, in which case I have the money I had before I bought it to begin with.
Don't be Judgemental Judy.