Dave Gallagher

Perhaps it's because they listen to what some non Aikido people say about the effectivness of it and they foolishly believe it. I don't know any Aikidoka who have an inferiority complex about the art.
I will say that I used to work security as a sceond job. It was in a housing complex in a bad part of town. Having been forced to control a few would be bad guys, I can't see any reason to feel that Aikido is inferior to any other martrial art.
I think it depends on who you train with and how you train.