Point taken. I've toned it down a little. You are indeed correct.
I think the problem lies in a mental short-circuit when it comes to posting or saying anything on the internet. It would be a good psych study. Why in the heck we say things, or post things, and think nothing about it. If asked to say them to a persons face, or to spread the rumor by mouth, we would think twice.
What completely baffles me though, is someones willingness to forward information that is completely false (not picking on the original poster here). Take 20 seconds and do a quick fact check. Then ask yourself, "do I still want to post this".
I think it's great that the school system my kids go to now teaches "critical thinking". They run "critical thinking" exercises all the time. It's a great way to get the kids to think about something they hear, instead of taking everything they read as true. I wish more adults would use "critical thinking".