I really loved your comment, all except for:

>from a long term perspective, almost nothing of what we do really matters.

So what? Yeah, in the long run we're all dead, so what? I imagine someone walking up to you, punching you in the face, and if you object, saying "Woahh! Calm down. From a long term perspective, almost nothing of what we do really matters. Don't you understand?" The things in peoples' lives matter plenty. What else is there. There is no other kind of 'mattering'. (Sorry if I misunderstood you.)