However, most successful social systems are based on suspicion and mistrust. That's total nonsense. All society is based on trust and good will, except maybe for some extreme police states. Most people don't kill and steal, not because they are afraid of the law or police. Trust and good will is the norm, and everything else is an exception.
Proprietary software aggravates selfishness.
Of course, people do have a selfish side, but that's not the full story, although business will tell you otherwise. Free software doesn't ask you to be unselfish. It asks you to be selfish in a non-harmful way. It never forces you to be kind and altruistic. Most people will want to help friends once in a while, and free software allows it.