When groups that are used to struggle from a position of weakness chance into power, they rarely use it as responsibly as they should. Like the dilemma of revolutions creating even more oppressive governments, but generalized.

Now in this case, we are talking about a long tradition of established power, not about a weak group suddenly rising. But I think the pattern might still apply: The rare powerful unions are not recent underdogs, but they feel a cultural oneness with the weak ones in other places. It must be very tempting to believe that you are fighting the fight of the typical weak union when you are actually expanding on the excesses of the rare powerful ones.