I call BS on this. You can read just the home page of the Second Harvest Silicon Valley homepage that demand has doubled and people have stepped up to fill the gap.
In conclusion you can find ample evidence that no one cares or you can find a way to make some tiny impact and attempt to influence others to do the same.
https://www.shfb.org/
SF spends something like 40k per homeless person per year: https://www.sfchronicle.com/bayarea/heatherknight/article/Bu...
It's a hard problem to solve.
Example (not necessarily the valley) https://www.reuters.com/article/us-usa-economy-charity/ameri...
In conclusion you can find ample evidence that no one cares or you can find a way to make some tiny impact and attempt to influence others to do the same.