According to Wikipedia's separate article for plastic bullets, they were developed to be less lethal than rubber (no citations for it though). IMHO, this could

According to Wikipedia's separate article for plastic bullets, they were developed to be less lethal than rubber (no citations for it though). IMHO, this could teach a useful lesson, that even the ones intended to harm less can be made harmful to the point of deadliness. I think it depends on the (ab)user, even dihydrogen monoxide is deadly when abused. Just wanted to "[point] out some consideration that hadn't previously been mentioned" and "[give a tiny bit] more information about the topic" (https://news.ycombinator.com/newswelcome. https://news.ycombinator.com/newswelcome.) :/