I think they honestly don't get it.
In their view, the rest of the airline got hit with 600 firings, including many long standing colleagues and friends. Heck, a swire prince got the push. So it is only fair that crew share the pain.
But, for those ground staff that didn't get the chop, package didn't change. Sure, workload increased, but no impact on take home.
Firing 10-30% of crew, because they are surplus to requirements after a re-org, would be equivalent, and frankly understandable - if the work isn't there, it isn't there.
Cutting crew costs 10-30% with the same number of crew is a completely different scenario. But in their mind, it is the same, and you are being selfish and ignoring the sacrifice of the 600 by not agreeing