It's possible tear gas may be a reasonable choice under extreme circumstances. Please take a look at the linked article (and HN comments https://news.ycombinat

It's possible tear gas may be a reasonable choice under extreme circumstances. Please take a look at the linked article (and HN comments https://news.ycombinator.com/item?id=23385741 https://news.ycombinator.com/item?id=23385741) and note that the Federal "Kerner Commission, which was formed in 1967 to specifically investigate urban riots, found that police action was pivotal in starting half of the 24 riots the commission studied in detail." Today we can see ample evidence of police escalating use-of-force (rubber bullets, tear gas, batons, etc.) on peaceful protesters.