It's heartwarming watching our community and the world rally behind Karen. But some of the response has been equally as vile. First, I'll just point out that Kimberly from the Buzz that you linked to is about as bad as those kids, not surprising she'd use two full days of her show to exploit this for ratings.
I think the anger needs to be directed at the school district here. Not the kids or even the parents. Why was Karen unable to do anything about this while it was occurring? The reality is, if she reacted they would have gone home, edited the video and only shown that part. In the end Karen loses her job. It's an issue many in the educational field deal with everyday. These precious little kids are never wrong. The other sad reality is if this wasn't exposed on youtube the school district would have never done anything about it. Karen reported it to the bus driver but it seemed to stop there. Had she reported it higher with no video evidence, the kids words would have been taken over hers for fear of the parents reaction.
Is what the kids did disgusting? Yep. How do we know they're all bad kids though? Often, one will be the ring leader and the other weak minded ones will follow thinking it's the cool thing to do or wanting to fit in because of peer pressure. One or two may be good kids for all we know that made a stupid mistake. Now they'll learn their lesson (hopefully) but they don't need to fear for their lives. I don't doubt that at least one of them is a vile little **** though.
Is it the parents fault? Maybe. But some kids just can't be reached. You can teach your kids all the manners and respect in the world but once they enter their peer group it's who can be the coolest. It's also hard to teach strength, if your kid is easily influenced and weak minded it can be hard to overcome that. Get them next to the wrong kid and they try to fit in. Luckily most kids are strong enough to overcome peer pressure and do the right thing.
What the internet is doing for Karen is great, what the internet is doing to the kids, family and those connected to them is as equally as vile and they are no better than the kids who harassed Karen.