couldn't a prosecutor say that you were trained in deadly fighting tactics and were probably out looking for trouble?
It this hasn't happened already, it probably will. It is well known that liberal prosecutors and lawyers try to turn the tables on intended victims who successfully defend themselves, buy claiming that the person was looking for trouble. Carrying a weapon or otherwise being prepared for self-defense is offered as "evidence" that the intended victim was looking for a fight.
There is has been discussion in other threads about whether or not we are giving in to these people by disguising our efforts to be prepared for self-defense. If someone feels strongly that they should not on principle hide their preparations for self-defense, I won't argue against that view.
However, I personally don't think there is anything wrong with using whatever tactics one can to defeat the liberals' efforts to rob us of our God-given right of self-defense. I have a very low opinion of such people, and I guess I just don't feel they deserve an fair and open fight.