Personally, when anger is justified, I feel more comfortable with people who clearly and openly express it.
I find them more reliable, more honest, and usually better people to be around.
By my standards, I'd even consider the style very mild, considering a life is on the line.
I would also consider it normal to be on the receiving end of such language if my own work resulted in such a situation. That would cause me to pause and reflect.
The intensity of feedback is information. If everything is bland, it's harder to know how important something is or not. Logic has a limit because you don't have all the parameters from the other side.
It works the other way around. The overuse of superlatives and day-to-day outrage is equally unproductive.
This is not the case here, IMO.