In the few times I (as a passenger) was grounded in the last minute by "techincal problems" I thanked God they grounded a potencial problematic aircraft, while the other passengers shouted and screamed and threatened law suits.
I learned that the hard way: I flew in an aircraft that happened to crash 1 week later with 99 people on board. Fokker 100, reverse opened during the roll, short runway, "minor" techincal problem detected on the previous day.