I don't think there are many "major" left-wing sites that are as full of hate and fear-mongering as a large population of their equivalents on the right. You are falling for the fallacy that both sides fall somewhat evenly on opposite sides of a normal distribution of "truth" or "balance". This is just not true. Changing times have pushed the overall country further right, but this process has also distilled the GOP down to a core of angry, white christian (males?). I don't think liberals are exaggerating that much when they say if Obama was white (or Hillary were a man), 20 years ago they might have been the republican candidates.