Compared to the stated goals of COP26 (which is exactly the comparison I made and that you've bolded), yes, it definitely is.
One of these things can long-term affect billions of people across the globe (not hyperbole [1]), potentially having an effect on millions of deaths (also not hyperbole [2]).
The other is a ~thousand people who, having now spent the last 2 hours reading the last 10 pages of this thread, seem to want a little more time off, and/or "fairer" pay compared to some of their compatriots. (I'm still not clear what the RMT's demands are, but that seems to be what everyone has spent the last ~300 posts arguing about.)
I'm sure you'll agree that one of these things is not like the other.
Hence my stance that a strike during COP26 is morally indefensible.
[1]
https://www.sciencedirect.com/science/article/abs/pii/S0959378002000900
[2]
https://www.proquest.com/openview/b...79bf9f1f9b/1?pq-origsite=gscholar&cbl=2043523
Pilots are only allowed to fly a certain number of hours (around 100 per month):
https://aviation.stackexchange.com/...-to-how-many-hours-a-person-can-fly-per-month