Earlier quoted context omitted.
Because behaving like this is moderately correlated with success. You don't have to be an asshole to succeed in business, but it can help.
Yes but I'm asking how. If you piss off your employees and they leave, how do you grow your business into a multibillion-dollar company?
Many people will allow themselves to be abused at work without doing anything about it. They'll commiserate with their coworkers, or vent on Glassdoor, or fantasize about leaving, but without ever following through.
So some good ones leave, and the rest get ridden hard and work on weekends and stay late to make their managers happy and rich.