A long time ago I worked for one of those named airlines as cabin crew and it was made clear in initial training that if you "pop a slide" you are fired. Period.

This was re-emphasized every year during annual emergency training. And each year, just like in initial training, we did the physical "touching" on all aircraft doors in the fleet for both opening them for emergency egress, and for arming / disarming the doors and slides for routine departures and arrivals.

I remember waking up in the middle of the night sometimes on overnights worrying about whether or not I disarmed the door I was responsible for. That is how important it was and how much it was drilled into us. Because it can literally kill ground staff outside the plane, which happened at my airline (and I am sure at others) when a gate agent operating the jetway was suffocated to death because a slide inflated into the jetway due to cabin crew not disarming the door properly upon arrival.

Those slides are no joke.