Don't you know?
I am not going to defend the strikers (or potential strikers as I assume it could still be called off) because I think they are probably wrong but.. my neice (who is somewhere to the right of Maggie Thatcher) told me the new contracts are seriously poorer than the old ones not only in money terms but also stopover days etc hence the unhappiness. On the other hand the BA contracts were I understand considerably better than most airlines. Can't imagine she voted for the strike, though the chance to spend Christmas with her young kids might influence her decision.