Because animals don’t think like humans? Humans are a much bigger threat (larger predator) to all of them. I guarantee they smell every chicken owner yet still take the calculated risk for a meal. They smell you but their eyes tell them you aren’t there same as coyote urine, bear, hippo or anything else. Mink run up and down creeks within inches of trails that coyotes and fox use regularly. The urine smell from other animals isn’t new to them. If you want to spend money on animal urines for deterrents don’t let me stop you.
I’ve always felt that the urine promotes a scavenging attitude in smaller game and attracts more than it would repel. It causes prey animals to disperse as well. I use coyote urine around my garden to deter deer. It works well for the prey animals.