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Less lethal weapons have similar problems as firearms is the thing. A taser is as effective as a gun for a murder weapon (since you can just kill the person after stunning them). Additionally the expectation of lesser damage to the target/less legal consequences might lead an untrained user to attack someone where they might not with a gun. So you still need background checks and lessons. Of course people being armed with less lethal weapons is far better than guns; if nothing else, you can't go on a murder spree with a taser.
The truth of the matter is violence is violence and you shouldn't use less lethal weapons unless you'd be willing to beat someone up with your fists, cause its about as rude. Most of the weapons we're talking about are far worse than they sound. For example the ADS basically makes people feel like their skin is on fire; AFAIK its never been used in the field because the only version they have is crowd sized and someone might get knocked down in the target area. Likewise rubber bullets against an unarmored target can break bones if aimed anywhere other than the torso. Pepper spray was marketed in the US as something for women to defend themselves from predators so AFAIK most criminals/idiots are too macho to use it, but its a pretty nasty substance. From what I've heard its like poison ivy x10. All less lethal weapons, even when used properly, can kill or cause permanent damage if someone has existing health conditions or is too young/old.
Its off topic but a while back Russia tried to invent video game sleep gas. They used it on a building full of hostages and a bunch of them fell unconscious, then choked on their vomit and died. In real life knocking people unconscious is a very bad idea if their health is a priority.
I was thinking more specifically about what to equip trained police officers with, not an "arming the public" deal. I absolutely wouldn't trust John Q. with a taser pistol or beanbag slug shotty. I'd just like a more reliable, less fatal alternative for law enforcement so they can do their jobs safely without accidentally (or "accidentally") killing loads of people, which I feel hasn't really been offered yet by current technology and production.
As an aside, while it's not pepperspray, I
have actually inhaled teargas before! Fun times. Can't compare to poison ivy, because I've somehow managed to avoid that while growing up.
Teargas was certainly what I'd refer to as "a disincentive", but drugged-up life-or-death I'm not sure it'd really put someone down... Mind, I also happened to be in the middle of my first encounter with atypical pneumonia when I went through the gas trial, so I might have had a different experience than most of the other people there. If you can just get beyond the feeling of choking to death and your head exploding, you could probably still rough someone up.
Note about the nonlethal firearm rounds:
They won't stop someone who doesn't feel the pain. The receiving end of a bullet hit receives somewhat less force than the recoil of the gun that the projectile was fired from, which means that at best you could rock a shoulder back a bit with a shotgun beanbag round or whatever. It's not likely to knock anyone down unless you're a master of gun-fu capable of shooting somebody's leg at the precise right moment to throw it out of place, causing them to miss a step and fall over or something equally insane.
More non-lethal options would be good, but humans are silly, squishy critters with a tendency to complain loudly when you break bones or use other always-effective ways of stopping someone from doing [name of action here]. Ultimately, the only nonlethal option as effective as lethal force is removing the situations that start the fights, entirely. Which is not really feasible for many reasons, I'd expect.
Y'know, I'd honestly not thought about it vis-a-vis recoil. Although technically, there are frequently recoil compensators of some kind and also the distribution of the force over a larger area, there's also plenty of resistance fucking with the projectile, and it's mostly about focusing the force rather than amplifying it via space magic... So, yeah, pain. Potentially throwing someone off-balance by hitting them far enough away from the center of gravity, but gun-fu. I just derped.
The unfortunate thing about loudmouth complainers is that you get the worst end of them when they're still alive enough to keep complaining. Which isn't a very pleasant path to trod when thinking of compliance-inspiration devices.
I'm just convinced that there's got to be a better less-lethal option out there that we haven't invented yet, because we're too busy developing more-lethals and the current generation of less-lethal is either unused or "good enough".