Yeah agreed, we can't stop people from saying bad stuff on the internet.
But i hope that she can find comfort and strength from those people around her, especially KARA. She isn't new to controversies and I believe she has the strength to tide through this again. It is not easy for anyone to face these comments, in reality. We can say she is strong and such, but it is not something that is easily overcome.
Hara had always seem to be more interested in dance, variety and perhaps acting. I never expect her to be super good at singing and I thought that the video wasn't too bad honestly. It just seems like some people are bent on humiliating her than anything (comparing her to SNSD Jessica?).
In any case, things like these just make me a stronger kamilia.