Vagrancy is the cause to harass, but they will pin something on them if they want to. Loitering, trespassing, and more. I worked at a shelter where a guest was arrested for resisting arrest. No other cause. They arrested him and charged him with resisting arrest, but there was no other arrestable offence. His public defender argued that he couldn't be arrested for resisting arrest if there was no reason to be arrested in the first place. The judge disagreed and he was sentenced to 30 days. I asked what he did to resist arrest, and he said he asked, "Why am I being arrested."

The truth is while being homeless isn't a crime the city still treats it that way and will charge people with meaningless offences because they can. A lot of it is to try and force the homeless out of the city to other areas, and a lot of it is to pad their numbers so they can use the statistics for more money. The homeless don't have the capacity to fight so they are the easiest targets.