What does the article writer care? Considering that the fact that a time traveller has already killed hitler in an infinite amount of alternate worldlines, it doesn't seem like it's all that problematic. This worldline wouldn't change at all (hitler died in his usual fashion), and time travelers wouldn't/couldn't effect it at all. It bothers me when people bring up killing hitler, but not because of the reasons listed (which were all terrible). The real problem is "why would you care?". Killing hitler would drastically change things, for better or for worse. On top of that, you are already risking your life for what? To kill hitler before he gets famous and then you wouldn't get any recognition. Or perhaps you kill him at the height of it all, but why wait? It's egotistical at worst, and pointless at best. Anyone who answers "kill hitler" as what they'd do with their time machine obviously never thought much about the question. And that disappoints me as a time travel fan.