Of course, there are many "learn-on-the-job" organizations that have gone forward and done amazing things.

However, while I agree that these issues don't naturally manifest themselves and stem from unprofessionalism and basic respect, I would argue that specialists and professionals in those functions (HR, Finance, Ops, etc) can help establish policies that mitigates and discourages such behaviors. If people can't do that voluntarily, then policies and consequences are enacted to enforce it.

This is why many companies (and I've worked in a few in the tens/hundred thousands of employees) have clear business conduct guideline policies and enforcement, because people who lack professionalism and basic respect for fellow humans are actually quite prevalent in any and every company. I've witnessed a few myself that led to immediate termination of my colleagues.