To extent, yes. Our police forces maybe seem large, but their numbers are limited and their organizational network is rather lacking. Even in big cities it can take up to 30 minutes to get from the station to the edges of their jurisdictions. Even with a specifically organized ARU in every station their response time would be far too slow to protect fellow officers and civilians from dangerous and armed perpetrators. However, multiple officers on patrol would likely be nearby and ready to assist within minutes. Technically we have ARUs, called SWAT, but that's specifically for when a specifically military-like response is necessary, not any time an officer gets in over his head with a violent perp.

The American system isn't perfect, but I think it works better for how our nation is laid out. If you want a police state, then by all means try to police like they do in other much smaller and more densely populated nations. Frankly, I'm all for reducing the amount of military surplus that ends up in the hands of police and doing a restructuring of their public union to remove problem officers and change hiring standards to allow for more objectively moral onto forces, but disarming them will severely reduce their effectiveness and put even more innocent lives in danger.