In fairness to BA the argument about low experience levels is probably flawed as they take so few each year. BA take perhaps 130 cadets a year, thats less then 4% of their entire pilot body, hardly creating an experience issue. BAs experience levels are probably amongst the highest in the world. Anyway BA took some experienced BMI pilots and were within their right to decide how many they wanted. The inexperienced cadet argument may only become valid if an airline is recruiting en masse. Other LCC airlines in Europe recruit hundreds of cadets and they will argue its not an issue while those LCC cadets fly with inexperienced Captains that does not happen at BA.
Obviously it can be disheartening for Pilots gaining experience in other airlines to see cadet schemes in an already saturated market but its BA's gig and they can rightly do as they wish, those pilots just have to sit tight and wait and see what happens when BA requires larger numbers. Anyone holding hostility to BA in that regard most hold hostility for every airline operating today.