A Taser can kill. Removing the presumption that you are shooting to kill seems like it would make the police more readily, and in more situations, use the weapons, so I'm not sure it's clear that a switch to less-lethal weapons would be a net positive (in terms of deaths).
That's an interesting way of thinking about it. That would mean we are either already at an unimprovably optimized combination of lethality and inclination to use force, or that the real problem is police weapons are not lethal enough.
