Stressed animals yield poor quality meat so it is in everyone's interest to dispatch animals as humanly as possible
This is true.
in my opinion electric stunning is the most effective
Maybe, however the kindest (least evil) way is to do it not in an abattoir at all, Unfortunately the volume of meat that the market wants means that we really have created death camps for animals. I don't even want to think about factory farming, perhaps the most evil thing that Homo Sapiens has done.
Take it from me not all animals go up to the halal slaughter man all happy and ready to go,
No animal goes happily in a slaughterhouse. Halal/Kosher or not, lambs curl themselves round the slaughterers legs in fear, hoping the slaughterer will be as much of a mum to them as the farmer who fed them. One day, our descendants will condemn our brutality and primitivism in doing this foul thing. The sooner the better.
Paradoxically, the most 'decent' meat I've eaten was in Sudan, where the little sheep was cleanly dispatched out of sight of the rest of the herd with a quick 'Allahu Akhbar' and a knife to its throat. Then we ate its liver and lungs raw (with peanut sauce) while a lady fried the rest.
If you want to attack Muslim (or other) immigrants because of Halal/Kashrut rules, think on about the supermarket meat you gnaw at and reflect about the wretched existence of that innocent animal.