and that is supposed to make it better how, exactly? should we just not do anything since it's over anyways?

Who said it makes it better? It's horrible, pretending that there is some kind of "massive action" that we should take, but that massive action would need to be to kill billions of people. If you want to do anything, go ahead, but the only thing we know that would work is killing billions of people within a very short time. Is that what you want to do? If yes, then how? It would need to be done carefully; if the world powers just start nuking each-other, it's not going to lead to the desired outcome.

And no, it's not over, the curve will just not follow the first or second line. That's all. The planet is still habitable at +4°C according to our best models.