That's just sad but like you said not surprising. I was once taken out three times in one race by the same guy because I was dirty and knocked him off, only thing was it wasn't me at all. I guess I was the first car he saw as he returned to the track or something, I don't know.
Another time I made slight contact with someone when passing so next lap they hit me so hard I hit the barrier at the end of a massive run-off area.
Don't forget that there's lots of decent and fair racers out there, it's just a few that manage to ruin a lot of races.