The fact you can't conceive of a world where police aren't needed is genuinely sad. We did just fine without a militarized police force for hundreds of years. Do you think human nature has changed in the past 70 years? That we have suddenly gotten more inherently violent?

Personally, I think traffic cops are the only part of the police force I can't justify getting rid of. Most other things seem like they should belong to the FBI, IRS, or the actual military. But traffic cops do actually important work.