You guys remember the phrase "Judge, Jury, Executioner"

That is not what the Constitution of the USA is about.
Not saying the shooter is innocent.
But you have a guy with an AR or SKS or whatever. Versus basically the government, with everything at its disposal. If not, then the SWAT team.
There is no less lethal option? No robot with stun gas, flash bang, whatever? Heck I don't know what they have. Even barricading the guy in there for 2 days without water, with a siege, can work.
Maybe in the future, Judge Dredd is all we need. No need for courts.
Here's another idea: Do we even know what the shooter said? Is he the shooter? (I mean, chances are yes he probably is, but how do you really know for sure except what they told you after he's dead?)
This guy got capital punishment. Death penalty. I thought usually you need the jury to be unanimous on that?
Why do we have some serial killer types getting 10, 15, 20 years and then coming back out to murder again? Meanwhile this dude got nuked in an hour.