This setup is also protecting the state from having to support these people through increased welfare and other social program costs. Therefore the state has an interest in encouraging or even mandating this form of agreement. Otherwise these people are more likely to end up on benefits and receiving assistance from social services that your tax money pays for. But if you'd rather have tax payer funded group homes set up with all the associated costs, that's up to you. I'm not a US citizen, so I've no skin in this particular game.