Agreed.
They have no interest in the upkeep of the property. Income issues aside, they’d also be the ones that fail the applications process (usually background investigation).
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Concerning section 8, if the feds increased their compensation enough and made it easier to evict troublemakers, the landlords would eventually participate voluntarily. But this would require the government to stop viewing landlords as class enemies.
That’s the whole point. To discourage private citizens from becoming landlords so the government controls housing, like the Council Estates in Britain.