No, homeless people are not everywhere.

Homelessness is created by high rents. High rents are created by high local productivity. The people who are productive enough to make it over the rent-bar are housed, and their marginal productivity above the rent-bar serves to raise the rent-bar (talk to any landlord about how they set rent prices: it's the local wages, stupid). This then pushes a greater proportion of people below the rent-bar, and then they are homeless.

There are few places in the world more productive per square foot than Silicon Valley, ergo one must be extremely productive in order to remain housed there, ergo it has an extremely bad homelessness problem.

That's why people making $200k+ (an extremely productive person by national standards) need public housing assistance in Silicon Valley (https://www.reuters.com/article/world/palo-alto-considers-su...). Which of course actually just... raises the rent again...

The charities may be full of grift and whatnot, but you can remove them entirely and you will not solve the fundamental problem.