An act doesn’t become okay because two people (the executive and developer) and a robot are now responsible instead of one. What is your justification for the sort of utilitarian calculation you’ve made here? Why do you assume self-driving cars will be safer without any evidence?

If we are going to be arguing from a utilitarian standpoint, suppose we hold the executives of self-driving car companies as responsible as if they were themselves drivers. Then if self-driving cars truly are safer as you optimistically claim, both fewer people will die from accidents involving them and fewer people will go to jail for those same accidents. Seems like a win to me.