Don't flinch from calling it what it is; this was a terrorist mass murder. The piece we're missing is the motive - and even if it turns out it isn't political, that doesn't diminish the terrorism.
100% agree Ranger.
This (and MH370) were not simple suicides. They were more complex than this.
They were both terrorist acts. However it is a different version of terrorism, and hence some people are having difficulty recognising it for what it is. Instead of the stereotyped religiously / politically motivated terrorism from "outside", this is terrorism from within.
Could be lots of things. Resentment at company. Resentment at society. Something else.
Sad depressed people kill themselves. Angry people kill others, and are willing to die in the process. But the killing of others is an important goal.
Unless the investigators have access to information not in the public domain, we don't know the specific goal in either case.
But pretending it was a simple suicide is as ridiculous as pretending this (and MH370) was the result of some bizarre combination of random equipment malfunctions / failures.