Fair enough, but that leads to an unarmed police force facing an armed populace, which either leads to armed citizen militias filling the power vacuum needed to maintain civil order against that armed populace, or a collapse in civil order, because people aren't going to stop shooting at the police.

Which is why I argue that it's an intractable problem barring repealing the Second Amendment. Even if there are legal ways to accomplish merely disarming the police, it doesn't solve anything unless you disarm everyone.