Why would they care?

1. The homeless don't donate to their legalized bribery PACS, and

2. The oligarchs who own both parties and captured our government decades ago want significant homelessness. Sticks, like capitalism scarecrows on street corners scaring the shit out of you to keep showing up to your meaningless job to be exploited for the owner's profit, are free.

Why pay for carrots (wages, benefits, careers, basic respect) when the the threat of sticks, ie visible homelessness, is free?

There is no incentive for our nation's owners to tell their middle managers in Washington to address homelessness, and every incentive to make it worse.