See 92 for some explanation. Some films just work for some people and not for others. Books and films with themes like that are interesting to me. I don't necessarily have to agree with them to like them. With that said, I don't see the great evil that American Beauty spawned on the world that so many on here seem to see.
It wasn't the nihilism that got me, nessarily. Most of it was the sick obsession the married suburbanite had with the young girl. That was a large part of the movie.
BTW, if you like actors that don't speak of politics I don't know why you would like Spacey. He was a very high profile suppoter of Bill Clinton.