I just don't understand how sensible union members can act as if the sky is NOT falling.

It is not business as usual. At my company, we provide software to retail chains, in Canada and in the US. Out of nowhere, in the last 6 months we've had 2 layoffs, reducing our staff by 20%. We are not likely to have raises this year, and personally I would be willing to take wage cuts and reduced hours and whatever else it takes to keep my company healthy and consequently preserve my livelihood.
Certainly if I knew my company was on the edge of bankruptcy, I do whatever I could to keep it going, although I wouldn't go on EI and work for free, as a bunch of people at one of my previous employers did.
It doesn't seem to be that way with the CAW or their membership. I see lots of anger with people saying management is out to get them, and a refusal to make concessions because management is asking for them to 'sacrifice' too much. Well, with an attitude like that…

As for the pensions, they were not fully funded. It looks like the payer will not have enough money to fund them, charitably because of circumstances beyond its control (everyone including the CAW says it’s due to the bad economy). Consequently, the pensions won't be funded. Oh, well, sh!t happens. That's life.
You want to change that, you better sober up and realize there are real problems that only
you can fix.