Actual statistics of practice? Nah, any analysis of all nonlethal weapons versus all lethal weapons as applied in the world is going to be pretty horribly unscientific. The whole "personal defense" weapon-carrying thing is really not my bag, either, so I'm in the dark as you mostly.
All the common technologies have pretty known and documented drawbacks, though - taser darts have noted issues penetrating and staying in contact and induce a fairly brief irresistible effect; capsicum needs contact with the mucuous membrane, and the jet is difficult to aim, as likely to splash onto unintended targets (like yourself) as any other spray, and can't always overcome someone hopped-up on adrenaline; and all the little clubs and kubotans and goofy ninja shit either just flat-out don't work or, since they rely purely on physical trauma, fuck people up so badly they can't honestly be called an ethical alternative to a firearm. Guns have their issues, too, aside from the whole killing-people bit - anything but a center-of mass hit won't necessarily physically prevent an attacker from continuing, though like the others if you screw up you might still succeed in inflicting enough pain to shock or deter.
You can find pretty decent detailed sources about any of these you like, or let me know what specifically you're looking at and I'll see what I can dig up for that specific thing (because holy shit are there a lot of different weapons out there), but nobody's done real research on how many taser barbs get stuck in somebody's jacket versus how many panicky gun-owners blow a mugger's fingers off and get stabbed to death or anything like that and I don't know how you would do that, though I'm sure you can find a million obese mall ninjas who'll argue passionately for the theory behind any given side.
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All the common technologies have pretty known and documented drawbacks, though - taser darts have noted issues penetrating and staying in contact and induce a fairly brief irresistible effect; capsicum needs contact with the mucuous membrane, and the jet is difficult to aim, as likely to splash onto unintended targets (like yourself) as any other spray, and can't always overcome someone hopped-up on adrenaline; and all the little clubs and kubotans and goofy ninja shit either just flat-out don't work or, since they rely purely on physical trauma, fuck people up so badly they can't honestly be called an ethical alternative to a firearm. Guns have their issues, too, aside from the whole killing-people bit - anything but a center-of mass hit won't necessarily physically prevent an attacker from continuing, though like the others if you screw up you might still succeed in inflicting enough pain to shock or deter.
You can find pretty decent detailed sources about any of these you like, or let me know what specifically you're looking at and I'll see what I can dig up for that specific thing (because holy shit are there a lot of different weapons out there), but nobody's done real research on how many taser barbs get stuck in somebody's jacket versus how many panicky gun-owners blow a mugger's fingers off and get stabbed to death or anything like that and I don't know how you would do that, though I'm sure you can find a million obese mall ninjas who'll argue passionately for the theory behind any given side.