I don’t know about Denmark, but in U.S. the “lifestyles” of most cows are so inhumane that the creatures, if intelligent enough to form such a judgment, might welcome an end to their tedious life, whether in a death that takes 10 seconds, or one that takes 30 seconds. (I’ve read that a main slaughterhouse torture for cows is waiting in queue after they’ve figured out what’s happening.) To focus on that possible 20-second difference, especially since the evidence is unclear and it could go either way, strikes me as bizarrely stupid. It’s the kind of lame-brained reasoning that gives fodder to right-wingers who think “liberals” aren’t very smart.
The legislation seems so silly from an animal-rights perspective, that I wonder if it’s actually intended instead as a jab at non-Christian religions.