If the move against ritual slaughter were included in a general cleanup of slaughterhouse practices, I would believe that it was motivated by an honest concern for animal welfare. A law specifically targeting ritual slaughter is a blatant piece of headline-grabbing by politicians wanting to have it both ways - please the right wing by bashing Muslims, while staying cool with the left by promising they're only doing it for the good of the animals.
If I were a parliamentary member wanting to stop this, I'd put down an amendment to add bans on a raft of other cruel and profitable factory farming practices, and let the media watch the government tap-dancing as they try to explain why their new-found concern for animal welfare stops at the door of the hallal butcher's.