19 Egregiously Unrealistic Things That Happened on This Week's Game of Thrones

By now it's been pointed out to me that dragon fire doesn't seem to affect White Walkers, but the wights? They instantly turn to toast. There's no way that Drogon, Viserion, and Rhaegal couldn't have wiped out the entire wight population in one fell swoop. By the end of the episode, it looks like the Night King's army is just as big as ever. How can that be?