Users here are simply expected to live by the spirit of the law—civility and substantiveness—when commenting here. Snarky one-liners that characterize a (vague) opposing view as "killing human beings" fail the "civil and substantive" test. Plus there's outright rudeness in comments such as https://news.ycombinator.com/item?id=11663455 and https://news.ycombinator.com/item?id=11651181, which has no place here.
The other two (chronologically disordered) examples are a product of my indignation with an obstinate person who wasted people's time and, brazenly ignoring their arguments as well as my own, continued arguing FUD.
Bottom point: I am not malicious and I contribute. So I'd appreciate if the trigger was not pulled on me even though it's probably the only way to get one's comments removed from here :-/