Even if we stop all emissions right now, we'll exceed the 1.5C target, so...
The nice thing with climate change is that it can always get worse !
If we miss the 1.5 target then the next target is 1.51. And so on.
Every point of a degree we can mitigate will matter a lot.
The Doomerist paralysis has been engineered by the folks who look to benefit the most from inaction, mainly the fossil fuel and related industries.
To not even attempt to head for the lifeboats is suicide.