Earlier quoted context omitted.
The point is, that if it isn't anthropomorphic, then there is (at least in some peoples' minds) nothing to do about it and we can safely ignore it. We can keep doing our stuff without second thoughts. So "finger pointing" to humanity isn't that bad of a tactic to get things done.
You seem to be arguing that if there were an asteroid that's going to collide with the earth, we would all ignore it.
If it's anthropogenic then it is a brand new phenomena in geological time and will throw many ecological systems into disarray or destroy them completely because they never evolved the adaptations. If it's not anthropogenic, then no big deal this is a regular cyclical warm period that the Earth goes through naturally. If it's a natural cycle that we're not contributing to then we have nothing to fix.
What in the world does this have to do with asteroids?