Why do some landlords participate in the section 8 program yet expect an obsceine amount of money for security?

Why do some landlords participate in the section 8 program yet expect an obsceine amount of money for security deposits from prospective tenants? Are these landlords not aware of the fact that section 8 program is for low-income, disabled, and elderly people? Then they should know that people in this category simply do not have the means of handing over large sums of money to rent a place to live. If they did, they would not be eligible for section 8.I think it's very wrong of some landlords to turn possibly good tenants away simply because they do not have 2000.00 and up to hold an apartment while it goes thru inspection process of the housing agency. Quite simply, "landlords", if you don't know, now you do, Section 8 is for poor people if you really want to help the poor, please follow the guidelines of the section 8 program and stop extorting money from the unfortunate and elderly/disabled. Section 8 is a good program. It is garunteed rent every month. Not all participants are good tenants, but a vast majority of us are. Just some food for thought, thank you.