[mightyham]

It is an obvious fallacy to conflate the usage of tear gas canisters with the usage of mustard gas in WWI. They differ drastically in amount/concentration, area of effect, and long term health risks, thus should be treated differently in considering their usage.

Tear gas clearly sits on a spectrum of non-lethal arms with various other options that are more or less harmful. While it's entirely fair to criticize its use on a case by case basis, insofar as disorderly public gatherings can have varying levels of violence/destruction, it would stand to reason that some instances warrant the use of tear gas.