The only good justification for killing the Romanov children is that their deaths eliminated the chance of restoring the monarchy should the revolution fail. This is the only justification we should use on the libs when they say “noooo evil commies killed the princess.”

It of course didn't. Where do you all get this thought that monarchies relied on one particular family to work? There were shit ton of aristocrats everywhere. Just pick one to be your new king? Royal families died off all of the time in European history. If Swedes can pick Marshal Bernadotte to be their king, then sky is the limit on who can become one.