I guess you're right, in my reading he more dodged the question than offering a direct judgement, though it certainly could be that implication. I read it more

I guess you're right, in my reading he more dodged the question than offering a direct judgement, though it certainly could be that implication. I read it more as "France killed Syrian civilians, so Syrians are killing French civilians", i.e. minus the "are justified in". Just as an aside, I think it's more likely the perpetrators were actually French civilians or perhaps Iraqi civilians, with an interest in conquering Syria for establishing the (Iraqi) IS caliphate. So perhaps the whole "revenge for syrians" angle doesn't work at all in any case.