All of what you say is true, for some landlords. Fortunately (around the world) its not true for many of them. That said the primary focus on money in the US makes the situation there much worse.
Western society also sees home-ownershop as a primary "good thing", and positions home ownership as a goal everyone should aspire to.
In truth, a large segment of the population is better served by renting. Those that move area frequently. Those who don't have sufficient capital or income to pay for such a large asset. Those who can't get a mortgage. Those who aren't ready to make a 30 year commitment to a location. Elder folk who don't want to die with a large asset, but would rather cash-out their house and actually spend that capital.
Since most Western governments do not provide rental housing (or are slowly reducing housing stocks) - it falls to the private sector (lumped together as landlords) to provide you need.
Incidentally shortages are not the fault of landlords, but of a population growing faster than housing supply. Supply is mostly constrained directly or indirectly, by existing home owners where the primary reason against any change us "preservation of house prices in our neighbourhood". This is driven by home-owners who have been persuaded that their house is an "investment".
So you may not like landlords, and like any profession there are plenty of bad examples to hate, but the removal of rent completely as a housing option would be disastrous to a huge segment of society.