That's a good point. Everyone needs to decided whether they wish to spend a few extra dollars to ensure that they won't have to spend a lot of extra dollars if something unfortunate occurs. Americans, more than Europeans, seem to be averse to purchasing insurance protection -- yet at the same time seem to be very reticent to accept the losses that incur when they don't have such protection. It's almost psychotic, on a sociological scale!
I think travelers really have to make a conscious decision: Purchase insurance or self-insure, and if the latter, then they
have to acknowledge, when something unfortunate occurs, like the liquidation of an airline, that indeed they
have self-insured, and therefore the responsibility for the losses they incur is their own. That's the time to apply some personal accountability, and move speedily onto the recovery phase, booking alternative transportation and paying for it from the "underwriting fund" they based their self-insurance on (i.e., their personal savings).
And if you cannot purchase insurance on a specific set of travel arrangements, then perhaps you shouldn't purchase those travel arrangements, eh?

From my standpoint, in those cases, it is clear to me that someone with control over far more money than I have has decided that it isn't worth the risk.