It never seems to end. Sometimes there's just not enough jackets accessible to those who need it.
Ppl get so used to the day to day life on a ship over years, that it never crosses their mind that the ship could sink. And even during incidents, they don't believe the ship is really at risk. They teach you that the ship is your safest bet. Stay with the ship. On the surface it sounds really stupid when these things happen but its a little more complicated than that.