Like, the only thing I can think is a "the Irish should stop breeding" argument, which would be pretty ironic if you're trying to paint me as the colonialist.

We might disagree about the solutions but I don’t think it’s fair to argue that I should never care about the quality of life of people already living in my city.

Great. That includes all of them, even ones that couldn't afford a larger space, right? And all the ones that do still want to live in your city? That would imply it's going to be just as big and just as dense.

Even if you redistribute the space available, you just put everyone in medium-sized spaces instead of a mix of big and small, and the total density is the same. We don't have a magic genie that builds low-density but sufficiently interconnected cities for free; it's not done because there's not enough labour and wealth to do it.