So? Does this make the argument wrong? Or does this mean that arguments that have been used once, cannot be used again? Arguments as toilet paper, in some way?
I'm French. France was occupied by Nazi Germany (as every American I ever speak to likes to remind me).
Resistants were ordinary French people who blew up trains in order to make the life of Germans in France as difficult as possible -- and of course German propaganda called them terrorists. I'm not putting this word in quotes, because of course that's what they were. They were trying to terrify the occupiers. It was a good thing.
Terrorists try to murder your children because your compatriots murder theirs.