There are two issues here
1) we are not supposed o discuss politics on the board, even when the discussion is simply stating obvious points such as: anti-Semites and racists have no place in civilized society. I agree with this point, and the thread should probably be closed for that reason.
2) A supposed problem with denouncing anti-Semites behind their back or without listening to their responses. This is just silly. I believe in free speech and even do not approve of the French laws concerning racial hatred. But we are under no obligation to give time to Le Pen and his ilk.