It's a tangent, but one worth dealing with briefly. I don't think it's people not caring about their safety. It's one of perceived risk. Some of us didn't know a roving watch was required. We know 'crap happens,' and could see there was one practical exit from below decks (which remains a reality on a number of other liveaboards), and we chose to do live-aboard trips knowing all that...and some of us didn't think there was (or know there was supposed to be) a constant roving watch all night just in case a fire broke out or similar disaster. We accepted the risk.
So the question becomes...when there's no roving watch, there's a risk, but how big is it? How does it compare to the risk of an acute medical event underwater, immersion pulmonary edema, hostile sea life, a major down current, or a range of other things that are highly unlikely on a given dive but do happen? It's hard to be objective about that in the wake of the Conception disaster with 34 deaths, but it's important. I imagine it's hard to be objective about the low risk of shark attack if you knew someone who got killed by a great white.
My point is, I don't equate willingness to go on a trip with an operation that didn't have a roving watch (but very likely does now!) amounts to reckless disregard for one's safety. We all make judgment calls about risk...usually without knowing the specific % change of serious injury or death, and often inconstantly (taking a bigger risk and passing on a smaller one).