Capitalist rent-seeking. Feeling entitled to make a profit off doing nothing except buying a resource other people need, because you already have enough money to do this.

If there were no homes to rent, where would people who can’t or don’t want to buy live?

The abscence of landlords does not preclude the existence of housing. The house would still be there if there wasn’t a landlord attached to it.

No it would just be a piece of land. The landlord bought the Land and built the house, without the landlord, it would be land owned by the government or a realty company.

In many cases, landlords buy already built houses and rent them out. The solution is to remove the landlord and give the house to the resident.