Irony would be the correct answer
it's harmful to not only individuals, but society as well. it is hard to combat because of how society works. If someone very influential says something ra cist, se xist etc on social media, that can teach many people to think saying things like that is okay. alienating someone from society is incredibly harmful, and it can influence others to do the same.
Yes. in order for true self discovery and figuring out our own limits we must push through the limits and rules we have been taught. in the process we may learn we agree with the previous set rules, or we may find our own way and form our own way of thought. No matter the outcome, defiance will lead to that point