Regarding your metaphor, and continuing on in the same vein - I don't think there is a gaping hole... just yet. But there are a lot of small leaks that are getting larger and more numerous all the time. The sump used to be able to keep up with, and even ahead of the leaks, but that is no longer the case.
Not only do I believe the hole is gaping but we don't even know for sure what caused it. If the globe is warming because of cyclical variations in solar radiation reaching the earth due to orbital precession then it is unstoppable by any means, even with all of Trump's nukes (lol). Even if not, global changes are not something that starts and stops on a dime. By the time you notice it happening, it's probably too late to stop.
That said, my comment about the futility of bailing water if there's a gaping hole was not in any way telling anyone e4lse not to do something. I try to be ecological-minded and do things like recycle cans, use reusable bags, avoid wasting water and electric, etc. But my point is that those doing these things have no business feeling sanctimonious about saving the world because it is highly unlikely that any of these things will have the slightest effect. And they certainly have no business in lecturing others and saying those not doing the same things are destroying the world.