[kitsune_]

I think you look at it from the wrong perspective, it's not about voluntary work per se, it's about caring about other people. If you dismiss people because of your stereotypes, you'll never get to know them.

If you're open and generous, sure, some people might abuse this, but do you want to be friends with such people?

If you want to get to know people and become their friends you will eventually have to care about them in one way or in another. Man, you can even be of opposite opinion, that disagreement could actually be the foundation for a future relationship. Who knows?

So in my opinion, being open, generous and getting rid of your stereotypes and bigotry when it comes to other people is a great way for making friends.