existentialist
Tired and unemotional
Thing is, it's all very well dividing the scenarios into gun/not gun. But if you take an (ex-)copper whose only real training is likely to have been shooting at an unarmed, or possibly pistol-armed, suspect and ask him to walk into a situation where someone's spraying bullets from a semi-automatic, can you really be surprised if he reacts in fear?That is what he was paid to do though. At the first sign of opposition mass shooters tend to flee or top them selves. Mans a coward.
I'm only a lowly walt, but I remember chatting to some ex-services people I worked with who'd done the whole hostage scenario thing, and they were very clear about how different going into an enclosed space with people firing automatic weapons was from taking out shooters in open ground, or who were only armed with handguns. Arguably, you still weren't THAT likely to get hit, particularly if they were confused/amateurs/in the dark, but it definitely wasn't the sort of thing they were going to do a) without lots of training, b) without flash-bangs and all kinds of noise, c) without >1 of them, and d) without similar weapons.