'Nobody has bothered to explain why profitable IB routes have been given to BA'
Please tell us which routes? IB was pulling off many shorthaul routes before IAG came along. It must have been ten years ago that IB aircraft were starting to become a less familiar sight at BCN. I don't recall any long haul flights operating from BCN other than via MAD.
Remember that BA pulled out of BHX and pretty much from MAN years before IAG came along. They were going through restructuring when this happened and BHX in particular has struggled badly since.
Within IAG the funds of BA and IB are seperate.
I can understand you are upset but IB should have restructured years ago and you cannot seek to blame it on BA.