I think it's like music for the sake of music, and a lot of the words stem from liking music a lot, wanting to be a good band and having a good sense of humour, and living in a situation where we're free to pretty much do what we want.
No individual is alone responsible for a single stepping stone along the path of progress, and where the path is smooth progress is most rapid.
Usually bad guys are much more fun to play and much more interesting to watch.