Not parent poster, but absolutely.

Look at all those other pre-2001 hijackings, and ask yourself what would have happened if most of the passengers were terrified that the hijackers were preparing to destroy the entire plane and everyone on it, regardless of any demands being made or met.

Would-be hostage-taking hijackers know it too: Their business plan, as it were, has been ruined for a generation by their suicidal colleagues.