There's been numerous times when we've been able to help our fellow travelers, and a couple when they've said hello (I meant help) is already coming. A few times I've wanted to stop and help but either the car was full, or I didn't feel safe with the family in tow given the situation I was seeing.
I try not to let my pre-conceived notions prevent me from doing good. But I do try extra hard to stop when I see someone that could be stereotyped by other motorists.
And... I always stop for a fellow rider, because it has been me!