Where did I say they're incapable? You're the one so gung ho over suppression fire. That usually means the side that suppression fire is aimed at stays in place hiding because like you say, they don't want to be hit. When they move around, they're exposing themselves.
You said:
It is irrelevant when you're dead.
Human snipers are perfectly capable of killing people, and according to you, this makes it irrelevant. So why aren't armies purely composed of snipers? Why do humans bother with suppressive fire?
I'm not gung ho about suppressive fire. I'm just pointing out the obvious fact that it's easier to make a less precise platform to solve a less difficult problem. You don't seem to understand that, so I'm trying to explain it by way of comparing human snipers.