An opinion would be something like "I think it's good that those kids were shot".

You could say that all day and people would not like you, but no one could do anything about it.

What Alex Jones did was deny reality. He suggested that the victims did not exist. He suggested the event did not happen and the grieving parents were government-hired actors. He riled up his listeners and effectively sent them after people. He did this in spite of knowing what he was saying on his show was not true. That was a large part of things, that Alex Jones was aware he was spreading misinformation.

Let's not pretend Alex Jones was doing was voicing a "difference of opinion".