You have to weed out those who are not suitable for the job. That makes good economic sense. Training can cost a company thousands of dollars per candidate and take weeks of valuable time and resources. In life, you clearly don't hire poets and painters to work on assembly lines. It helps to understand the profiles of the people you hire before you invest in training.
Turnover is definitely a challenge.
High turnover either means you hired the wrong people or you didn't coach them to handle the stress. Listening skills and having that 'smile' behind the voice are even more important than technical skills today. The first step in the 1,000-mile journey is understanding what you need.