The basic theory behind kosher and halal slaughter
I appreciate that, and in the original middle eastern conditions that gave rise to that form of ritual slaughter they probably did make a lot of sense and were more humane than other options. But technology marches on and there are far more human options now that make use of knowledge not available to early followers of middle eastern religions.
There's also a question of economy of scale where increased populations make k/h slaughter either completely uneconomical or degrades the process so that it's not very close to the original conditions (not to mention the fact that much modern ritual slaughter is done in free rider conditions within non-ritual conditions).
In the context of Europe, halal seems less about anything like religion and more about maintaining religions for their own sake and or keeping the lines between muslims and non-muslims as distinct as possible (making it easier for parents to subvert the assimilation process by passing on their culture shock trauma to their children).