According to Wikipedia, freedom of speech is the political right to communicate one’s opinions and ideas.
So whatever I think and say may be right by me but not by others. The thing is, in any given issue, there are opinions. Not what is right or wrong. For instance, let’s take homosexuality. Some people think it’s wrong and some think otherwise. Again, neither of these categories are wrong. No one can force their opinion on others. It’s like when scientists have different theories.
Having an opinion is not wrong but when one can’t tolerate other people having other opinions and acts upon the frustrations, it is wrong.