So... it's okay to do something illegal - and dangerous - back, because someone did something illegal to you, and the referee didn't call it? I find that to be considerably harder to believe than anything I've read in the rest of this thread. Sweeps are illegal by your rules - I don't have a problem with that. You expect your referees to enforce the rules - I don't have a problem with that either. You find it acceptable to break the rules because someone else did it first and it wasn't responded to the way you think it should have been? I do have a problem with that, and honestly, it's not something I'd have expected from you.
If someone is sweeping me at one of our tournaments with impunity at one of our tournaments, it indicates two things:
a) My opponent is out to hurt me, not win the match. At 2nd dan level (I have to compete at that rank because of my TKD ranking), anyone I'm fighting knows damn well that is an illegal and dangerous technique
and
b) the referee is not looking out for my safety
It then becomes combat, doesn't it?
Bah, truth is... that is my gut reaction and what I SAY I would do, but the truth is, if my past behavior is any indication, I would just suck it up and finish out the match playing by the rules but watching out for the next dirty technique from my opponent.
I have taken hard, illegal shots (blind technique, for example, or excessive contact to the mask area) in the past that the ref didn't appropriately respond to, and that is what I have always done: take a moment to compose myself and finish out the match by the rules (albeit there WILL be a BIT more juice on the techniques

)
But at a certain point, just because there is a referee standing in the vicinity, if someone is out to HURT me, then it becomes a matter of self defense, no?
In any case, thanks for calling me on that, Kacey. You are right.
And as for competitions in which sweeping is ALLOWED: well heck, I see nothing wrong with THAT at all. Might even be fun to try one of those out someday.
But slipping in a dirty technique knowing you will get a warning the first time as a way to obtain an advantage?
That is counter to one of the Five Tenets of TKD: Integrity