Thanks for that link @Orchid. I post alot about recognising narcissistic traits (e.g. The romance developing quickly into a serious relationship = lovebombing) and so many people jump on it saying "stop armchair diagnosing NPD" and that it's becoming "a sport" on MN.
The reality is that these people are out there and there is a distinct pattern abusive men follow. Alot of the traits listed as narcissistic traits fit into the patterns listed in your link and we need to move away from thinking these men "kill in a red mist of rage". It isn't true. Men who value power and control over human life (because they lack empathy and therefore are narcissists) are much more likely to kill and there are so many red flags that are apparent early on in the relationship.
I'm not saying one thing in isolation is enough to say someone is definitely a narcissist, but there are so many threads where several concerning traits are listed and it is a possibility (particularly coercive control) that the OP may want to consider so why jump on people who raise it.
I agree this should be taught in schools and everyone should learn the signs, even as adults. It could save so many lives and prevent so many women from entering into and staying in abusive relationships.
I think alot of people don't recognise the danger they are in for example when their ex is threatening suicide.