The New York Times has an interesting and detailed article on internet harassment. Some quotes:
In the days after the Megan Meier story became public, Lori Drew and her family found themselves in the trolls’ crosshairs. Their personal information — e-mail addresses, satellite images of their home, phone numbers — spread across the Internet. One of the numbers led to a voice-mail greeting with the gleeful words “I did it for the lulz.” Anonymous malefactors made death threats and hurled a brick through the kitchen window.
Jason Fortuny calls himself “a normal person who does insane things on the Internet” … In his mind, subjecting epileptic users to flashing lights was justified. “Hacks like this tell you to watch out by hitting you with a baseball bat,” he told me. “Demonstrating these kinds of exploits is usually the only way to get them fixed.”
I asked Fortuny whether a person is obliged to give food to a starving stranger. No, Fortuny argued; no one is entitled to our sympathy or empathy. We can choose to give or withhold them as we see fit. “I can’t push you into the fire,” he explained, “but I can look at you while you’re burning in the fire and not be required to help.”

