These profiles that you supposedly can't walk away from is the real danger for me. Trolls will always exist no matter what so that's a non-issue for me. The problem with not being able to walk away is not only expressing something but also simply being able to cut ties with a company. Wikipedia as an example, there is no possible way to cut ties with them, it's likely not legal but who's going to fight it? Steam, if you buy thousands of dollars worth of stuff off but need to walk away from them - you can't, you're locked in. If you delete your account somehow, you lose what you've paid for and that's a dangerous position to be in because someone else has control of your assets. Steam it doesn't matter much because it's entertainment but the more we hand over this control the fewer options we will have in life.
As to unpopular views, they need to get out. People need outlets to discuss the merits and drawbacks of unpopular ideas or they will never be anything but. Right or wrong any time minority views are suppressed, whether by self-restraint or external pressures, it's bad for society. A simple example cropped up in the news today. A couple girls were stopped by police for cycling topless. It is and was an unpopular thing but someone had the idea years ago, and took it to court. The courts agreed that it was an equality issue and women have the right to go topless in public if they so choose making the police stop illegal. Without pursuing that unpopular idea though, it would have been legal and the police state would be dictating dress codes... which is exactly what we point to as "evil" in other states and throughout history.