"Some people do. Devil Summoners. They make pacts with demons and fight alongside them. Those people need extraordinary magical power to pact and tame demons. weaponize them. The most I can manage is to barter with demons I can negotiate with, talk them down from fighting or trade information in exchange for sparing them. I haven't the ability to tame the demons, so I don't."

What he does have is the ability to dump gratuitous amounts of fire and gun onto any demon that crosses him. He's good at that.