Why do people apply for jobs they aren't willing to perform & why are employers willing to hire them?

My local UPS station has hired a guy who is scared to death of dogs. I’m leery of strange dogs & can somewhat understand his fear; however, he refuses to deliver packages to recipients if he even sees a dog. My neighbor has a Great Dane that is in a fenced in yard & this driver refused to deliver my package because he could see a dog in my neighbor’s yard…BTW, my yard is fenced also. On another day, he refused to deliver my package even with me standing outside looking at him because a small dog had gotten out of her fence. I know he didn’t know this dog doesn’t bite; but he could have drove the truck down the street & I could have walked out to the truck to receive my package. This went on for 3 days before I called in a complaint & the supervisor put a different driver on my route the next day so I could get my package. I know it’s crazy, but there are 9 dogs on my block alone; so, I don’t understand why he was hired for this route. IF I owned a delivery company, the first question on the application would be “Are you afraid of dogs?” If yes, they’d go in the do not hire stack!!! This is only one example & there are many other examples of employers hiring people who only want to do “part” of the job. I might understand it IF the job market was oversaturated; but there are people willing to do the jobs as required that are overlooked for people unwilling to cover the job requirements. Can you help me understand the thought process???