Hypothesis #1: The only thing that has ever actually mattered is the way humans behave towards each other and towards other living things.
Hypothesis #2: Truth matters as an end in itself.
I'm inclined to believe both of these hypotheses but I also suspect they conflict. "Truth" is tricky to define, but here it can mean pretty much anything but a pragmatist conception of truth. The pragmatists basically claim that "true" means "whatever it is best for us to believe", which is consistent with H1. The problem is that only philosophical pragmatists accept this definition of truth. Everybody else, from young earth creationist to Marxist revolutionary to Dawkinsian fundamentalist, either has a stronger conception of truth or tries to avoiding talking about it at all.
Are H1 and H2 incompatible, and if so which should be rejected?