Stiglet, I would hope that companies work as a result of cooperation between employee's and shareholders, collective bargaining allows a fair balance to be found between profitability and remuneration; provided that it is done responsibly.
As I acknowledged in my first post, I know nothing about Easyjet or the closure of the base in Madrid. I made an assumption which may well have been wrong.
I do however believe that Pilots generally are excessively reasonable with Managements who stop at nothing to push terms and conditions down "in the race to the bottom". When a group of Pilots reach the point where they really feel they need to take industrial action, then in all probability it is because nothing else has worked.
You are correct- "whether any contract is good or bad is subjective" therefore as a colleague of the Lisbon Pilots you should accept their point of view and acknowledge their right to strike without the intention to interfere with that strike.
By the way your view of secondary action is skewed, if the Lisbon Pilots travelled to England to prevent you from flying out of London then that would be secondary action. In fact, what you and your English colleagues are planning to do is to travel to Lisbon and fly the Aircraft normally flown by the Lisbon based guys..... if you refused to do it, that would not be secondary action in the same way that one person working in one factory would not be carrying out secondary action if he refused to travel to a striking factory to operate the equipment of the striking factory.
I do believe that travelling to Lisbon to operate the aircraft that your striking colleagues normally operate is beneath contempt.