People make serious, necessary life choices based on their employment. People have to know within reason that when they sell their house, move across the country, sometimes even to another country, decide to have kids, etc., that provided they're doing their job well, they're ensured some reasonable manner of security. At the same time, people need their own limited and precious time away from work to be their own; it's right. This is why laws for fair grounds of dismissal exist, and why they should account for things like the social media witch hunts we've been seeing.