You don’t understand how deeply ingrained their hatred for Armenia goes. It’s literally what they spend surplus money on.
First, Turkey and Azerbaijan are effectively dictatorships flying under the radar using oil money and “west-friendly” trade policies.
Second, Armenia has been Christian for as long as Christianity has existed. Turkey and Azerbaijan are Muslim. There are millennia of wars and conflict over forced conversion that have resulted in “Armenia is the devil” propaganda making its way into the Turk cultures.
Third, in the Turk and Azeri mind, Armenia is the one threat to their “Turkic manifest destiny.” They believe the Caucus should be theirs in order to create a unified “great” Turkic civilization.
So yes, when these countries have the means to buy very efficient weapons, Armenian lives become at risk.
I mean that's means, not motive. "They have weapons, and therefore they will kill everybody" makes no sense to me.