Kindness, as I understand it, has to do with how you treat the people you personally come into contact with. On HN, that means how you relate to other users.

I get that you're using the word differently and that's fine, as long as we understand what each other means by it. It seems like you're defining your political position (on homelessness in this case) as 'kind' while the opposing position is 'unkind'. Presumably someone of the opposite view might take issue with that, but I don't.

Since it's in your interest to argue for your views in a way that is personally kind to the people you're arguing with, I don't see any tradeoff between our two usages.