If it's put on the internet it becomes everyone's business.
A public park is everyone's business, but that doesn't mean I can/should go over to it and piss and stuff all over it.
Just because someone's information or photo's online doesn't mean it entitles you to use it to harrass and belittle people.
Brush it off as soppy good two-shoes business, but just because you're online, it doesn't mean that morals and ethics don't apply.
Your varying degrees of anonymity don't change the way you should act.