It's our choice if we choose to live in a world where we are fearful and suspicious of everyone or we actually trust them. I choose to live in a world of trust. Sure sometimes I might get screwed but the great friends I make and the quality of life it gives me is worth so much more.
Not trusting people is basically fear. Living in fear is no life at all.
trust is a high value commodity that you cant expect from cheap people.. it all boils down to character.