It was clearly an extra-judicial execution, just like Christopher Dorner. They cornered someone they really wanted dead and ignored every convention and law to kill them. In the case of Dorner their thirst for vengeance led them to shoot and murder multiple unrelated people. [1]

In a democracy with rule of law, the police have to be held to a higher standard. If not, they are just an armed gang with a licence to kill. It also undermines any concept of negotiation or surrender. The next person will go out guns blazing.

[1] https://en.wikipedia.org/wiki/Christopher_Dorner_shootings_a...

This seems pretty absurd. The guy was in the middle of a mass murder--interruption via lethal force seems appropriate. I don't think it's realistic to expect that we can apprehend every mass murderer without trading off innocent lives. I certainly wouldn't want more people to die so we can say that we tried negotiating with the shooter. I strongly prefer this outcome to Uvalde.

Not to mention the guy was trained military with an express desire to murder police--who knows what the police would be walking into.