I was specifically countering your argument because it is impossible to disprove. No matter how accurate our climate simulations or understanding can get, there's always the possibility for something we've missed. That's why we create these models, refine them and adjust our behavior accordingly.

I'm afraid I can't agree with you here because if your claim is that 'we don't know fully how climate works, then things might not be as bad as we think', the opposite claim is also true. That is, 'we don't know fully how climate works, therefore things might be worse than we think'.

It's entirely possible that there are other mechanisms or feedback loops we don't know about which when triggered could cause a massive cascading effect making the global temperature rise rapidly.