I am most certainly not a vigilante and I don't ride around on my white horse trying to save people from themselves, but I do try to help by reporting incidences that not only affect me but can affect a bunch of other innocent bystanders as well. I feel that if I'm removing one crook from the steady stream of crooks that seem to flow into Sacramento from all points, that I'm somehow supporting other fellow human beings.
It's not only that I can generally spot a crook from a mile away and that I might just normally harbor a suspicious nature, it's that other people seem far too trusting and they make easy marks for scammers. If they didn't, the scammers wouldn't be able to get away with it.
You can read more in my personal blog today about Strangers Sleeping in Your Bed and the FBI.