When I lived in a town of 300 people, and was an LEO there, we always had family drama to deal with - always. But that's how it is - the homicides we had though were never a result of that. They usually involved drugs... I also don't think that sexual orientation comes into play here; it would probably make someone angry to find out that their wife was actually a lesbian, but not enough to brutally (and METHODICALLY) assassinate 8 people. I also believe that because the autopsy results are being withheld, there is clearly something in them (most likely about how they were murdered, caliber of the weapons, etc) that is extremely sensitive to the point of implicating specific people, thus the police would be 'showing their cards' (so to speak).
As for the method and planning, mass shootings perpetrated for senseless motives are most often well planned and well executed. It's actually how one succeeds in hitting several victims.
Mass shootings are relatively frequent. How many times we were left thinking the perp was a pro only to discover in the end it was done by a young guy who prepared in secret?
Hec, now ismy turn to share personal experiences.
1) I described earlier in this forum the mass shooting at my school: An angry 20 year olds with a rejected application to the faculty, pissed at the women who broke his heart and took his place in the classroom. He killed 14 of them. It was well planned and well executed.
2) more recently, the city where I live in became the target of terrorists attacks. We would think they do this because they believe, but they don't. Most of them are losers who feel rejected by the system. They are 20 years old. These attacks are well planned and well executed.
And I will give a counter example. 3 young losers, all girls, 19, 23, 39 were arrested this week after a failed bombing attemp. It was not well planned, was not well executed, and it didn't work.
My conclusion:
Of course it was well planned and well executed. Does it means the perps were old pros with rational motive? No, absolutely not.