Litebulbs, I can see your point that only strikers lost the perk (ST) which does, from some points of view, appear as victimisation. Perhaps if the perk had been removed without prior warning, more would see that viewpoint.
However, fair warning was given which, I think, most see as changing the situation substantially.
The legalities of it will, no doubt, be debated for a long time, or until a court rules one way or the other.
(Though to be honest the constant repetition of arguments does get a bit tedious)