Ah. I'm having a hard time understanding what you mean, then, thanks for attempting to clarify, but I'm still completely confused.
Altruistic people are generally altruistic because they want to be altruistic for their own personal pleasure, not because they expect anyone else to be like them. So how does "grossly over estimate other human beings" come into play? If anything, most altruistic people underestimate other human beings, due to exactly the thing you mention... which are things that everyone has already noticed.
My altruism was eroded by life experience. I can't quite bring myself to actively screw others over, but I'm definitely not the 'good person' I once was.
Maybe true altruists are more resilient - but they're also much more susceptible to abuse.
Altruistic people are generally altruistic because they want to be altruistic for their own personal pleasure, not because they expect anyone else to be like them. So how does "grossly over estimate other human beings" come into play? If anything, most altruistic people underestimate other human beings, due to exactly the thing you mention... which are things that everyone has already noticed.