These democrat counties usually try to offer better homeless support either at the local government or NGO level. In doing so, all the red/republican counties ship their homeless using Greyhound Therapy.
Helping to make homelessness not suffer as much gets more homeless, thus flooding the system.
We've increased our homeless population by 4x in the last 5 years. It popped up hard after the ban on evictions disappeared. Turns out kicking people out of housing makes them (drumroll)... Homeless.
I'm in California. We have a large "native" population of homeless and have been a popular destination for "Greyhound Therapy" for decades. It's the same where I live in every part of the state I've been through in the past several years. Police tend to clear homeless off main drags and parks so they end up moving to less policed areas like outdoor preserves and trails.
I try not to judge homeless people as it happens for a thousand reasons, many outside peoples' control. That being said having open spaces filled with homeless doesn't make anyone want or even able to use those spaces. It's not just the people but tents, trash, and literal shit.