Halal and kosher slaughter is not anymore inhumane than typical slaugher practices. I doubt majority of people are jumping up and down because of 'inhumane killing' reasons but because 'Halal' is a 'Muslim' issue and Muslim issues should automatically be judged with distrust.
The UK Farm Animal Welfare Council (FAWC) says that the method by which Kosher and Halal meat is produced causes severe suffering to animals and it should be banned immediately.
According to FAWC it can take up to two minutes for cattle to bleed to death, thus amounting to animal abuse.
Compassion in World Farming also supported the recommendation saying "We believe that the law must be changed to require all animals to be stunned before slaughter."
Some people do care about the cruelty that is caused in the preparation of their food. The science tells us that the slitting of the throat of a live animal causes much suffering as the animal slowly bleeds to death, just to ensure the blood is drained out. Why? Because of superstitious believe that eating blood is offensive to god.
Slit it's jugular, the animal loses consciousness nearly instanteously and then rest is history.
If you know a person who had to be killed, for what ever reason, would you recommend their throat be slit and left to bleed to death or would probably go for something a little more humane? Maybe the axiom - "Do onto others..." comes to mind.
how'd you think people killed their lifestuck before stunning became the norm?
You say before stunning became available people killed their animals in that way as some sort of justification to continue a barbaric practice today. So why not just bring back slavery, or child labour? Thats how it was done back then. That's how we got our work done back then; afterall even scripture recommends it.
We advance as as a race and leave behind the despicable practices of the dark ages. And slaughter of animals using halal/kosher methods is unacceptable in an ethical, caring, advanced society. Hence that is why non-Muslms should care about the source of their food.