You're welcome to properly end your own fertility at any time. I quite like humans.
How many destitute families are you sheltering in your home?
The world is polluted, and heating up. The most obvious parameter of that is this: the sheer number of people.
You can like people and be on board with the idea that there is such a thing as too many people in one place at one time. The extreme example of that is crowding incidents in which people die, like the one in Seoul this Halloween. No, it's not always "the more, the merrier".
Buildings, vehicles, and various structures and equipment which support or carry people all have maximum occupancies.
Maybe, so do planets?
This is the worst argument ever. I'm not sure what kind of fallacy it is, but it's a really really bad argument.
It's even worse than the "if you really wanted to lose weight you'd find a way, so obviously you just don't care that you are overweight" argument.