But BA didn't want any money out of you at all in the first place...they only wanted productivity savings and the streamlining of allowances, which would have benefitted junior crew to the detriment of those on the old contracts, who somehow manage always to get the route with the best allowances.
You can indeed be supportive of your union and its negotiations, but ultimately the end-point of negotiations or indeed a strike is the agreement of company and union. At some point one or the others' views will move and through negotiation a settlement will or should be reached.
As you are new contract crew, why would you not want transparency, and elimination of a system that systematically screws you for the benefit of elder crew?