Every scab comes up with some reason that they crossed to attempt to justify their backstabbing behavior. There is no excuse. Period. Like Mike734 said, plan ahead. If you are on probation, your union will probably not ask you to strike. They will make it clear to the membership that probationary pilots are not being asked to walk. But even if you did walk, and management fired you, you would probably get your job back after everything was said and done anyhow.

If you cross, you will be branded for life. That is much worse than having to sell you house or borrow money for an emergency surgery. I know people's families come first, but if you are getting into this industry, make it clear to them NOW, ahead of time, that under NO circumstance will you ever cross a line. That way, no surprises or excuses.

Of course that's just my opinion. I could be wrong.