Sure, if you fight back, the bully is less likely to pick on you. They’ll just pick on the next weakest kid instead.

So what, I'm supposed to let myself get beat up so the bully doesn't pick somebody else instead?

Your theory is bullshit anyway, the more times the bully encounters resistance, the more opportunities that bully has to learn to be better.

I don't think you've thought this through.

You should volunteer yourself as a victim to save others! You sound like you're very noble.