I have been thinking the same things as you about this missile launch.
A moron could probably launch the missile (a moron likely did)
I heard a talking head on FOX today say it would take 2 years to train a soldier to fire the missiles.
Advanced weapons like this can be operated (poorly) by almost anyone.... It’s like giving a grenade to a monkey.
As a side note, rebel towns were under heavy air strikes from government forces for weeks, a number of jets were downed by the rebels and there were already rumors that they have systems capable to down aircraft well outside of typical manpad range, yet some idiot flew a commercial airplane over a place like that.
It is not that I’m looking for an excuse for rebels but their motives is better understood than for example actions of airline and Ukrainian ground control.