No-one likes to see people losing their jobs but claiming that Iberia's losses are a fiction and its employees are the victim of a vast conspiracy by the British against the Spanish will get you absolutely nowhere.
As some have learned from bitter experience, if IAG management is intent on pursuing change they will do it and those that won't engage with management will find themselves sidelined. Far better to accept change is happening and influence it as far as you can.
Anyone who has observed Iberia can see it needs structural reform to survive. BA has already been through this. It wasn't pretty but it's come out much stronger for it.