I will leave the story to the journalists: http://www.eurogamer.net/articles/2014-12-15-controversial-mass-murdering-game-hatred-appears-on-steam-greenlight

TL;DR Valve removed "Hatred" from Steam Greenlight (it had 93% positive opinions), because it's too brutal, but they are still selling on Steam titles like Postal series, Grand Theft Auto series or Manhunt.

And here is proof it was doing really well after only few hours on Greenlight:

http://i.imgur.com/xbbpuy2.jpg (replaced with higher quality image)

BRING "HATRED" BACK!