In USA, grand jury is not court - they are the grand jury and can indict. In USA, court decides punishment like prison or fine and that (punishment for a crime) is defined by Legislature. Sublime sang about a specific criminal code of California: https://leginfo.legislature.ca.gov/faces/codes_displaySectio...

But who puts you in prison? Indictment doesn't matter if there is nobody to enforce it. Laws without law enforcement doesn't work.

What will happen if you remove the police force is that someone creates a private police force, like a mafia. So now the government no longer can make laws, the mafia makes the laws, essentially dismantling the country.

I guess you could use the military to enforce laws, but martial law isn't a good thing either.

So saying you think the police is net negative is essentially saying you think it would be better to live with a mafia ruling your life. They would knock on your door and demand money instead of the democratically decided tax rates etc, is that really better?

Courts have bailiffs, judicial marshals, and security officers. They should have no problem transferring convicted criminals to jail. Police aren't required at all.