Earlier quoted context omitted.
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This isn't a case of a noncentral fallacy. > "Tear gas is bad because it violates the Geneva convention" makes as much sense as "MLK is a bad person because he's a criminal". Not really, no. The Geneva Convention has specific reasoning and rationale for making tear gas illegal during warfare, which does apply to tear gas and make perfect sense. That's not the same thing as saying taxation is theft, or MLK is bad.
Mind elaborating? The arguments in sibling comments seem to be some variant of "avoid escalating to more dangerous chemical agents". I don't see how that's relevant to protests. Are we seriously expecting the protesters to escalate to mustard gas because the police used tear gas?