The basic training that lasts a few weeks that involves yelling, breaking down a person only to rebuild them stronger by the end could be looked at as filtering and weeding out those who would not work well under those conditions. This is part of the interview process. Once basic training is over most move into positions without yelling.

In this case yelling was used to belittle everyone and secure more power. If you break someone down but never build them back up you have crushed people.

If we still want to turn people into killing machines than yelling is a tool to help that process.