What cops really need is more training to not shoot first and ask questions later. 18yo marines manning checkpoints in the middle east are expected to more or less hold their fire until they come under fire. Domestic police should be held to similiar standards.
You could say that disarmed police in regular patrols can be safer as it is less of a threat to a criminal. this would obviously not apply to known cases of dangers or cases were reinforcements are unlikely.