If failure isn't an option, then success isn't either. Success is just failure repeated until it works.
The problem with holding a grudge is that your hands are then too full to hold onto anything else. It might be the competition or a technology or the lousy things that someone did a decade ago. None of it is going to get better as a result of revisiting the grudge.
It's human nature to quit when it hurts. But it's that reflex that creates scarcity.
Go ahead, fail. Try to avoid mistakes, though.
Authenticy in marketing is telling a story people want to hear.
A bully is playing a game, one that he or she enjoys and needs. You're welcome to play this game if it makes you happy, but for most people, it will make you miserable.