I don’t think it’s appropriate to wish ill on other people. When writing I think it’s just as important to consider the impact of your words as it is to express your ideas and emotions. These sorts of words can make people feel unsafe, and in extreme situations can inspire similar feelings in other people with similar problems. Maybe someone that might take more direct action than a blogpost.

I understand different regions have different communication style, but the murder rate in the US is too high for us to joke about these sorts of things.

I disagree, but I appreciate your perspective. I think it’s fairly clear that the author is using exaggerated speech to make a point and convey their feelings. The reason I mentioned regional differences is I often find myself having this disagreement with my west coast compatriots.