USDA FSA
I work in Swedish agriculture and here putting up land as collateral is very common. Of course it may be different where you live.
You can still want more housing without wanting more landlords... They could always sell the houses
That's true but some housing always has to exist as rental properties as there will always be some people who can't pay for a house upfront especially young people who can't be expected to have saved up for one. I think we both agree that exorbitant rents are bad. But I would argue against the notion that every landlord is bad for society. However if you were to say that maybe only the state or the local city should be allowed to be a landlord I would say that's totally fair as long as that's managed in a good way and leads to enough housing getting built. I myself used to live in social housing owned by the municipality for 8 years and thought it was great.