By hitting back you're lowering yourself to the same level as the person hitting you. Rise above it. Be the better and bigger person.
I'm sorry, but I can't articulate how completely I disagree with this statement.
By this logic, Donald Trump encourages Neo-Nazis in Charlottesville.
By this logic, everyone who defended their country against an invading force is equally morally culpable as the invader.
I dare you, just once, to go find a WW2 veteran, and tell them that they are just as bad as the Nazis and should have "been the bigger person" and just let them invade.
It's pacifistic bollocks and lazy thinking. Sorry. If you're going to take an ethical stance, you need to take a stance that works across all circumstances.
Responding to a forceful aggressor with force in kind does not make you as bad as they are. It makes you an autonomous human with a sense of right and wrong, and the will and capability to defend yourself when attacked. They are still the aggressor, they are still in the wrong, they are ethically worse than the defender.
For those saying "Never hit back, go tell a teacher" then I hope your children never encounter someone intent on attacking them when no "teacher" is available. Better to get in a fight or two at school, learn what it's like, and know how to throw a kick or a punch when necessary, than to have no experience of defending themselves at all when they're being raped in a dark ally or attacked in a nightclub. "Telling a teacher" will cut no ice whatsoever in the future, so I don't see the point in enforcing that as their only method of defence right now.
I was bullied in Primary, til I caught the foot of someone who was kicking me, stepped into him, and forced his foot above his head, making him fall over.
I was bullied in Secondary, til someone tore my book out of my hand and ripped the pages, so I jumped the table, bodyslammed him into the wall and started punching him in the face.
I was bullied on the schoolbus from Secondary, until I got up just before my stop, turned around, and punched the person who had been pulling my hair in the face three times before stepping off.
After each of these incidents, while I still didn't have many friends, at least I wasn't dealing with physical abuse every day to go with the verbal. In each instance, the bullying was known to the school and never acted on in any meaningful fashion. Telling teachers simply got you a label as a "Grasser" and did nothing to deter anyone.
Thus I will teach every single one of my kids to deal with a bully in a similar way if necessary, and to defend others they see being bullied in exactly the same way. Each of my kids will learn a combat sport of their choice for at least a year so they have the basic muscle memory needed to punch, kick or grapple, according to the sport.