I read Steiners decription of what a fanatic is. I burst out in laughter as I so often do when I grasp something he says. He said a fanatic is someone who thinks he is right and wants to convince others immediately of his believes. When others do not thoughtlessly accept what the fanatic has to say, the fanatic get's upset and even agressive.
But then there's the quetsion: do you prefer a fanatic or a sponge like chamaleon? I'd rather marry a fanatic.