So list your perceived benefits then. Preferable without resorting to insults or more diversion.
"Halal" is a broad term that isn't just specifically the slaughtering process. I guess you could break it down as pre slaughter and post slaughter.
Pre Slaughter
There are certain animals that aren't halal and can never be, regardless of the slaughtering process. These are generally animals that are carnivores (crocodile, lions, dogs, pigs, bears). In the western world it's generally accepted that these animals shouldn't be eaten except for pigs. The reason for this is to prevent disease. Animals that eat other animals can pass diseases between species. It also means that it's possible for these animals to consume human meat. There are many adverse health and mental effects if you indirectly consume human flesh. Unlikely, but it could happen; especially during wars.
When the animal is slaughtered, it's done one by one opposed to mass killings by machines. How do you know that every chicken killed by Inghams was alive before it went into the machine. There is also the issue of draining the blood once slaughtered to prevent pooling and spoiled meat. By having the slaughterer one by one kill the animals with Islamic practices, it's another level of quality control to filter out sick animals.
All abattoirs in Australia have to abide by government regulations in terms of animal care and hygiene. If an abattoir wants to practice halal methods, they're doing it on top of what is required.
Post Slaughter
Halal meat can be tainted if it comes into contact with non halal meat. So restaurants can't claim to be halal if they're cooking bacon on the same grill as halal meat.
Halal can also mean that a product doesn't contain something that isn't allowed. For example chocolate could be classified as halal or non halal whether it contains animal products.