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That's an excellent point, that in order to bring in a robot they more or less pre-meditated executing him in the field and likely means the suspect had not moved to escalate the situation. You don't prep the bomb and then only set it off once the perp has made his choice to hurt someone else.

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The perp had told the police that he was going to kill more officers if any came near him. He had already (probably) killed before, so how is it not imminent danger?

You can't just "wait him out" and hope he won't escape.

That's essentially every crisis situation and the normal response is a trained negotiator not an executioner.

They used both in this instance.

They had a negotiator, for multiple hours. I don't know if the negotiator gave up or if someone else made the decision to end the standoff.

Why can't you just wait him out? Isn't that the standard procedure when a criminal is holed up with a gun? You secure the scene, surround him so he can't leave, and then wait until he gets tired of hiding. You only go in if the suspect has hostages and it looks like you won't be able to save them otherwise, or possibly if the suspect is going to kill themselves.

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