Ofcom did not say you could go round saying what you like. As I keep saying, it is not that you are "entitled" to an opinion, more the case that no one can stop you from having one (without some very nasty things being done to you and they are currently illegal).
Voicing your opinion is another thing entirely and the Ofcom report was far from one-sided. They said:
This was a finely-balanced decision. Mr Morgan’s comments were potentially harmful and offensive to viewers, and we recognise the strong public reaction to them. But we also took full account of freedom of expression. Under our rules, broadcasters can include controversial opinions as part of legitimate debate in the public interest, and the strong challenge to Mr Morgan from other contributors provided important context for viewers.
They were saying the broadcaster got away with this because Morgan was strongly challanged. On another day with a less challenging debate, they would not have done so.