Seriously, perhaps people can empathize with how Mullenweg came to behave this way. When people around you are doing it, it affects you; it subconsciously sets new norms, resets the boundaries in your mind. It impacts your emotions - you are drawn into their emotional state. And then you start acting like them.
Many, many people I know and in the public eye professed extreme dislike for Trump's behavior, but my impression is that over the years, many of the same people act more and more like him.
The trick is that when someone violates your values, you don't want to do the human thing and follow them - we're social creatures, we instinctively follow the crowd. You want to consciously be a leader, consciously remember your values and reset them, and lead the herd to a better place. That's why calm under fire, grace under pressure, dignity and composure are so important.