Write with a crusade mentality?

This may sound a little strange but I've always wanted to ask about something. I like writing, I've started several stories for my own personal enjoyment. The joy for me is in creating the worlds with all of its lore in my head. I know that if I ever try to publish I should read a few books in the genre I'm writing. However, what if the reason for desiring to publish is based primarily on disgust for much of what is out there. Writing because I hate ideas which seemed ingrained in just about every story I've ever read in the fantasy type. Is it worth it in your opinion to write because of a crusade mentality? To put out something worth reading that smashes the old umptions with a new view? (I don't want to say what it is, lest it influence your answer.)