@sickburnbro This is one of those cases where it can be pressed to say "what you say might be true, but it's also irrelevant". If he protests then he should be forced to answer where, exactly, he is going with that line of "reasoning", as if infinite invaders are justified because the French and Norwegians once beat each other over the head over a strip of Irish coast. At least force him to say the quiet part out loud.