> “The United States may justify firing tear gas [...] as legal, but the decision to use an indiscriminate, psychologically terrifying toxic chemical was excessive and certainly immoral."
https://www.usatoday.com/story/news/2018/11/27/tear-gas-forb...
https://acoup.blog/2020/03/20/collections-why-dont-we-use-ch...
TLDR: They hit you just as hard as they hit the enemy and they are wildly unpredictable.