These poor helpless cops! Next you'll be asking them to exercise the same level of reason and common sense as civilians! OK, I get that you're saying they're sort of pre-emptively traumatized by their training and socialization and I partly agree, but in saying that you're implicitly also saying they have less responsibility than civilians with no training, which is an inherently self-defeating position.

Look, in this situation they're armed, covered, and have a strong numerical advantage etc. etc. etc. and you're offering a panic defense. If I was to rely on my anxiety level to govern my conduct I'd have killed 30 or 40 people by now.