Human behavior is a very complex thing. Both when people are on there own and also in groups. Snapping people out of there routine (getting out the same way the got in, taking there bags with them), cultural/tradition (there have been cases where man let woman go first; which is not very efficient) and group behavior (do whatever everybody is (not) doing).

Snapping people out of this behavior is hard. Especially when people are not trained to do so and have no intention to even try taking note of any safety issue. Even the little safety briefing/video at the start of a flight; how many people actuall listen?

Wonder what recommendation would be done if many people would have died because of people getting there bags; More aggresive communicaty by the flight crew? big fines for people with bags during a emergency? Automatic locking overhead storage bins (with obvious signs it's locked) during take off/landing? No more carry on bags?