Couldn’t you use your car? 24 hour fitness for showers? I see many people do that. They don’t bother anybody. They’re actually trying to work very hard, it’s just the property values are so costly, that they end up homeless in their car.

The homeless that are on the street are typically very hostile and going through drug withdrawal. It can become a public safety issue then.

A car isn't an option for everyone. I personally don't have a car. And 10 years ago when I was homeless, I couldn't afford to keep the car I had; it got towed because I couldn't afford to pay for the registration. On a more practical note, I was too big to sleep in my car anyway.

Sleeping in the car is also illegal in a growing number of places[1]

[1]: https://nextcity.org/daily/entry/10-facts-homelessness-2014