Musk and Jobs were both extremely mean and degrading to employees. How do we reconcile the revolutionary nature of their products with the terrible behavior of

Musk and Jobs were both extremely mean and degrading to employees. How do we reconcile the revolutionary nature of their products with the terrible behavior of their childish CEOs? Is it really that hard to calmly criticize? Maybe the stress of these duties drives susceptible personalities into berating and belittling?