Can't people have an opinion any more? I've growing tired of this crap.
It depends how factually based that opinion is and how you choose to express it.
Taking an extreme example, if I had a large audience and said that someone had an extensive criminal history for very unsavory things involving minors, when that was incorrect, it is understandable that person may be somewhat aggrieved and seek some form of restitution. Especially if by expressing it on the scale I did had a negative impact on the subject, financially or otherwise.
Essentially, you can have opinions, but there are consequences for actions and in this instance it appears that the court will decide.