If you work in the leisure industry, which is where Ryanair, and BA to a lesser extent, sit fair and square, you don't get holidays when the customers have them.
And furgusd talks about BS! There are many of us working in this industry who DO get holidays at these times, yes there are restrictions and most accept that as part of the job!
As for
The sole aim here is explicitly to cause maximum disruption to the public to achieve your goals
, whilst there may be a few thinking along those lines most will be trying to cause maximum disruption to the Company and be happy if the Customers are not affected - this certainly happened for TCX where the management pilots had to work nights and weekends, all the flights left pretty much as normal but the company caved in after a couple of strike days, I don't think anyone striking was unhappy that the customers were not too affected!