a valid point
Regarding the efficient, non-lethal dispersal of dissenters. in a democracy, I think dissent limited to passive resistance would be a strong argument against the use of non-lethal control. I also doubt that any non-lethal methods would be up to stopping a movement with enough force behind it. Counter-measures would be developed by any well organized cause.
There will be much teeth gnashing about it but I believe some here will be around to see the genie out of the bottle. Dead is dead and not is not so it has an almost irresistable appeal.