[CalRobert]

Because it imposes costs on others for your own benefit. It's rational, but it's still selfish.

If you don't want me to live next door, buy the land. As it stands now you can forbid me from living on land you don't own.

[gaius]

I can forbid you from polluting upstream of a section of river I own (hypothetically, I don’t own any). That’s a perfectly reasonable thing to do.

[ambicapter]

And this is similar how?

[gaius]

We’ve established there are ways and reasons for people to influence what happens on nearby land they don’t own themselves. Now we are merely quibbling over the details.

[CalRobert]

People need homes. They don't need to pollute

[gaius]

But we are not just talking about “homes” but “homes in a specific neighbourhood” and you can easily say they don’t “need” to live there in particular.