Roaring Kitty brought meme stocks back to life. His first post in three years in mid-May caused GameStop (NYSE:GME) shares to triple in value almost overnight. It also dragged other left-for-dead meme stocks along for the ride.Yet, the reaction to the meme lord (his real name is Keith Gill) by Wall Street was telling. The Wall Street Journal reported that discount broker E-Trade, owned by Morgan Stanley (NYSE:MS), was mulling whether to ban him from the platform. The investment firm’s financial crimes divis ...