People keep making more people, so who builds their houses?
Developers. If there is more demand in a market, they will build property, then sell it to whoever is willing to buy, or, will seek funding from an existing institution, which if it's not landlords, will be housing cooperatives, then use that funding to finance new buildings. Traditionally, when we're talking high-density housing, the buyer of these properties is a landlord. Without that landlord, the demand still exists, and someone, or some group of people, will inevitably fund the cost of the housing. In a world with no for-profit landlords, housing cooperatives fill in the gaps. (primarily for high-density housing specifically)
Either existing cooperative members come to an agreement to pay slightly higher rents in order to build up a fund used to later purchase and expand their pool of housing, (which later increases the benefit they receive from economies of scale, and reduces risk of a major issue in one building causing a lack of revenue altogether) or a new cooperative is formed with money pooled from members, and once a specific threshold is met, they collectively purchase the property.
Housing is a good with inelastic demand. Everyone needs housing. There will always be someone, or some group of people willing to buy. And if you don't have landlords to artificially increase the price of housing, which only goes up so quickly because of its commodification, and further purchasing by for-profit landlords, then the overall cost for a cooperative to outright buy a new property, or for a new cooperative to raise the funds required, is substantially lowered.
When I look at both parties, I see one party that is substantially more fascist. Fascism, notoriously, loves furthering genocidal rhetoric, and doing genocidal acts. If I had to pick which party I think is more likely to provide a worse outcome to the genocide, it would be the more fascist one.
I in no way think either of them will magically stop the genocide, give Palestinians sovereignty, or stop destabilizing the rest of the world with conflict driven by global imperialism. But I have good reason to believe one of them will do substantially worse things in that direction, so I will do everything I can to at least make sure that person doesn't get into power.
I truly hope you are capable of telling which party represents each possible action.
I do not. Kamala is substantially less likely to do a genocide on American soil, compared to Trump. Trump is substantially more fascist, and is much more likely to continue endorsing and funding the Israeli-Palestinian genocide.
It's not as if Kamala is going to keep supporting the genocide of Palestinians, but not do a genocide in America, but Trump will stop the genocide of Palestinians, and maybe do a genocide in America instead. He'll just do both.
And considering Trump's rhetoric, I wouldn't trust him to handle the genocide of Palestinians better than Kamala. I see the option that has the least (but not no) negative effects as voting for Kamala. I do not want to, but I sincerely do not want Trump in power even more than that.