it was a little over the top since i do not have anything to smear the other 4 with (besides the fact that they were colleagues with a white supremacist cop and did nothing). but nonetheless, micah johnson is an accidental agent of justice. or vengeance.
i don't think justice would be the right word for killing a cop just because he is a white nationalist, but there is a good chance that the guy may have saved a life in the future. this asshole liked facebook groups that were clearly just waiting for an excuse to kill (says so explicitly on those pages) and were clearly hostile towards blacks, muslims, immigrants, and gays.
again, not sure about the other 4, but he may have done one big favor to humanity here.