...as far as I see them with what I know right now.
The first shooting was done by a homeowner who reportedly entered his home to find four men ransacking it. At least one of those four came at him and he drew a handgun and fired - killing the suspected bad guy. The other suspects fled.
The other shooting had a bit of an unusual twist. As per the report, a few guys, in a vehicle containing over a hundred pounds of marijuana, were pulled over by police and one of them fled. The guy who fled then stole a Nevada State Trooper's car to make his getaway. Sometime after his escape, he reportedly fatally shot himself. Somewhere in the interim, the article does not explain it well, he allegedly also carjacked another vehicle. It was reported that the alleged carjacker killed himself with a police shotgun (apparently found in the car he stole from the Nevada State Trooper) and thus it was a stolen gun he used in the alleged suicide. Yet, it still seems like a good shooting to me since it depletes the gene pool of what I can only see as undesirable set of genes.
I imagine someone will want to screw over the state trooper for not protecting his vehicle and shotgun. I also imagine that family members of the deceased, if any, will soon have a lawyer and try to sue the Nevada State Police because they will blame them for giving that guy access to the gun. It certainly would not surprise me in the least if someone is awarded millions after this because such is life in lawsuit crazy America.
All the best,