In America, except back in the Wild West when they hanged horse theives, death has never been the penalty for theft. Never. Killing someone because they are on your property and 'might' steal something is thinking you have a license to kill. These laws, like the Castle Doctrine, make people think they just shoot and won't be questioned.
I posted one example of that and how the home owner went to prison for life. This is a similar case. Kaarma may go to prison for life.
Watch this program. The home owner thought he had a license to kill anyone who entered his home. He sat it wait like Kaarma. He shot to kill and made sure they were dead. He planned it. He didn't call the police, but lay in wait for them and blew them away. Many similarities. He went to prison for life. Laws like the Castle Doctrine are not a license to kill...
There are enough differences between the Montana case and your Minnesota example that the comparison is probably not going to hold up under a closer scrutiny...
For example, the Miinnesota shooter...
1. was sitting in a comfy-chair in his basement, waiting for the idiot-teens to come downstairs
Kaarma and Pflager...
1. Had left the garage door open and when alerted, took a position outside the front of the house looking back into the garage, giving him a vantage point that cut off any possible egress and would push whatever was there back into the house--- rather than using the door connected to the house facing into the garage, which would have given him a position to push away from the house, in other words to drive him away.
2. shot the boy once to wound him, then walked up to him and shot him in the head, to kill him after he had been disabled
2. Shot across into the dark in a sweeping motion, aiming both high and low to cover everything (and lied about that motion to the police)
3. did the girl in much the same way when she came downstairs
3. N/A
4. dumped the bodies on a tarp to avoid staining his carpet
3. N/A
5. waited an entire day after the shooting before calling a neighbor (rather than the cops, right away)
5. Waited until the property had been breached and the garage sprayed with buckshot, (some of it even penetrating the house btw) and switched on the lights to see his victim for the first time before calling 911
6. stupidly made voice-recordings of the incident in his basement; the lead-up to the shootings, the shootings themselves, and the post-shooting timeframe; giving strong evidence that he enjoyed the hunt, and meting out those deaths.
6. Stupidly made predictions of what he was going to do, promising that they would be "reading about this", reported he had been staying up waiting for the occasion, giving even stronger evidence that the hunt is exactly what he was on.
That would be enough to hang Mother Theresa, never mind some dipshit in Bumphukk Minnesota.
The fellow did, indeed, try to use something akin to the Castle Defense, but...
With an event-sequence and damning evidence like that, he was 'toast' the day the trial began.
Kaarma, on the other hand, suffers from no such handicap.
Whoops... not quite true... we have the hearsay testimony of the hairdresser, and, perhaps, a few revealing verbal clues served-up by Kaarma himself, during the course of the interviews, but, nothing on the order of what that idiot-shooter in Minnesota had working against him.
I have no clue whether Kaarma is innocent or guilty of premeditated homicide of some kind or another, but the Minnesota case you're serving-up here seems like a different kind of critter.
IMHO.