But PAX don't train for an evacuation. Best they'll listen to the safety instructions, read the safety folder, find the nearest exit and try to remember. But they haven't done the drill in a dark cabin, half filled with smoke, flames engulfing the fuselage and people screaming and panicking to add to the stress.
Just asked one of my kids;
"You're on a plane, it's on fire, you're been yelled at to evacuate, what's the most stupid thing you could possibly imagine doing next?"
He thought for quite a long time (several seconds) and said "fiddle around with the overhead locker getting my bag out?".