It would be really surprising if our best-value course of action, relating to climate change, was exactly the same regardless of whether climate change were human-influenced or not.
we know that pushing this button has coincided with a change in climate trends over the last 200 years. what we have to prove is then that a. this is not a natural change, and b. this change can be slowed down or reversed.
would you say that if science proved we are past the tipping point that nothing should be done to reverse the effect we've already had?
I think it's clear that if we could know, and if we could all agree on that, that it would be important to accomplish. but I don't think we can ever all agree on it. so it's not important to accomplish (in fact you could say it's already been accomplished, we already know, and it's not enough, we don't all agree despite the fact. that's what I'm trying to get across by arguing the point of human-caused real climate change)
I am not convinced that "making obviously terrible arguments" is an effective way to shut up one's political opponents.