[angersock]

You misread "mood". "In a guessing mood" is another way of saying "Willing to take time to consider all options."

Operational doctrine here suggests that, with active shooter, you prioritize removing the shooter once negotiations have failed. The "probably would have" the poster is referencing is a what-if they didn't have time for.

[EdHominem]

> with active shooter, you prioritize removing the shooter [...]

... to save hostages, of which there weren't any.

Except if he'd had planted bombs on a deadman switch, which would have been triggered by taking him out.

They're lucky he was lying. Not smart, not skilled, lucky.

[angersock]

And to save officers.

[EdHominem]

Not true. The officers weren't in danger at that time. He was hemmed in, and bleeding.

They killed him because they were mad and didn't care about the consequences (unfound bombs) to civilians.