You can bang on BALPA's door all you like, ACBUS. It won't make any difference. SMB has hardly budged against the union in all his time (except for the odd day off here, and a bit of a productivity scheme there). I can't wait to see what's been agreed this time!
If you're not happy, you leave. Most of the SFOs have gone. The first trickle of Captain's are off to Easy. Many more will follow now. It's not being defeatist, it's just a better option. bmi will NEVER change.
If you are happy, you put-up, shut-up and see it for what it is. Just a job. Take the money and go home at the end of the day.
Life is all about having choice. BALPA is one, ALPL is another. Think of what benefits you need from your organisation, then decide what gives best value for money. You choose.