I think it is fair to say a majority do it for altruistic reasons and do not believe it is facilitating our own demise but more to save on body bags.
If there are people doing it for this reason they need to have their head examined. Constant reductions of training sectors, sims etc. Hiring more low experienced bods to fill seats, training maxed out. This needs to come to a head, the sooner the better. By facilitating this system it allows it to continue in its present form. If it truly is the majority doing it for altruistic reasons they should all quit training to bring this madness to an end. That truly would be for the greater good.