Unfortunate reality: most of those alternate self-defense gizmos are basically shit for self defense. Pepper spray hurts, but there's no guarantee it'll drop a guy, and even less you can get to it fast. Same for ranged tasers. Guns don't really improve on those flaws, but at least you can get training for one; don't think I've ever heard of a course in pepper-spray use.
Touch tasers are even worse, though. Have to get the guy in the neck for the full effect, see. Nearly impossible to do that in a struggle, but it's easy when you're sneaking up behind someone. In other words, it's a lovely weapon for rapists and crap for stopping them.
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