If they go on strike and refuse to do the job I pay them to do then I'll have to sack them and find someone else who will.
Problem is, when the majority of your staff go on strike you can't just sack them all, paricularly ones such as the engineers at Aer Lingus where Aerospace Engineers are already in extremely high demand, you'll have lost them to other companies with in no time, and it'll take years to train in new ones, as with cabin crew you're talking about upwards of 10 weeks to train them, much longer in fact, as you'll no longer have the people who are trained to train them on your pay-roll. So in practice, that doesn't work. No airline can survive for 3-4 years without operating flights while they train in new staff. You have to reach a compromise.
Share holders stocks will be worth nothing if the company doesn't exist.