But there now seems to be a police on moral thought. If someone dares to speak against an opinion that the left holds dearly, they're now subjected to having their careers and lives ruined. Don't you think this stifles alternative thought?
Throughout history, groups have always sought to stifle alternative thought. The moral difference is in the tactics they use, which have ranged from censorship to violence and bribery to peaceful protest and civil disobedience. I, for one, prefer and even encourage peaceful public outcry of this sort. Say what you want, but if your customers (users, friends, coworkers) don't like it they don't have to buy from you. In fact, they probably feel a moral obligation not to. This doesn't only happen on the left - remember the Million Moms (or whoever) boycotting JC Penny for using Ellen as a spokeswoman?