We're living in a time when people are reacting to the prospect of a world war with a stupid smiley face and arguing on internet forums. That's not being scared, that's not a reaction to war and death or impending doom. The prospect isn't real yet.
Even if 'WWIII' does happen now, it's not gonna be Russia invading America's borders and scenes out of Call of Duty. Neither side are gonna have any interest or advantage slaughtering civilians and nuking each other. They're not even arguing about each other, just a poor obliterated country thousands of miles away. They're not gonna go "you're wrong about this, so I'm going to kill a random million of people living in your country with a WMD or warfare, that'll settle it and get everyone onside".