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 :-/
If you want to argue semantics of the words or the phrase, we can do that. If you want me to use a dictionary to justify my use of the words "human" and/or "being", I'll do that. If you want textbook (medical) definitions, you can have it right away at https://goo.gl/ZFDcbg. And if you'd like more scientific literature backing, consult https://goo.gl/zXpbAu. If you are willing to cede that the nomenclature fits, but would like to now rank human beings by worth in relation to stage of development, I would like to provide arguments for why you shouldn't do that. Finally, if you have reconsidered everything, I would invite you to the Way, the Truth and the Life, as scary as that might sound. Peace be with you and yours.