If only that. Take the well-known case of a woman who overheard a private joke between two men on a programming conference and posted an outraged message to social media, which promptly got one of the men fired.

It's not the person who got hurt that "leveraged modern technology to broadcast that opinion to as many people as possible" - it's the other person, the one who overheard stuff and got offended. This is why many start to feel afraid voicing their opinions - because even if you try to keep it to a small group of your friends, there's no telling when someone decides to rebroadcast it publicly on the Internet, and then all hell breaks loose.