i don't think the guy is a retard (except the jibberish he yelled before he hit, that sounded kinda funny), i think judging by how slight the turn was, and the fact that he spun in a fwd car under hard acceleration.....i think he just aquaplaned. if he was foolish enough to go out in those conditions with shaved r-compounds, then that was probably what put him in the wall.
driving in rain is an excellent way to hone your skills, but that much rain is not good for your health