It is not a mitzvah if it compromises someone’s emotional and physical safety.
That’s not true. Even where one is pattur, such as a legitimate safety concern, there’s still a mitzvah, and one needs to find a safe way to do it.
I find it hard to imagine that such a situation is “emotionally unsafe”. It’s very easy to use “emotional safety” as a copout to avoid doing something which is difficult.
I could much more easily see this as a physical safety issue. Okay, so call the guy on the phone and tell him he left his keys in the door, and hang up quickly (but politely).