With the advent of the internet, even the smallest minority has been given a voice. This has done great things for spreading information and ideas (e.g. Arab Spring), but it has also given a platform for spreading bias and hate as well. I'm not talking about name calling or childish acts, but threats of violence and damaging behavior.
This increased noise is easy to ignore until you become the focus of it, which is why private website owners are taking steps to protect individuals from harm over allowing a blank check for freedom of speech.