Liberals worship procedure and power above all. Foreigners and even working class citizens being slaughtered is fine as long as it follows the technicalities of the rulebook. Even if they scream about them and profess outrage its only to the extent they can use them as a prop. Physically threatening, even in jest, a member of the ruling class isn't just against the rules: it challenges the very legitimacy of the rules. That is the ultimate sin to a liberal.