Well I hate to break to to you but we DO cut down the healthiest trees and let the small ones grow up in their place, its a selective silviculture system, also referred to as highgrading. Most of those 'sick' trees are simply being repressed in the forest understory. So yeah, your analogy is crap also. But I see your point, not entirely wrong when seen from a human perspective. I stand by my point though, strength is relative.