Just because something interests the public does not mean it is in the public interest...
The fact that something is of interest to the public does not mean the revelation of that information is in the public interest. Public interest in this context refers to the disclosure of information relating to crime, serious wrong doing by corporations, individuals, or goverment bodies. It does not refer to the bedroom antics of a particular football player.
What right do we as members of the public have to read about the sexual activity of celebrities and sportsmen in the tabloids, without their consent to the disclosure of this information? I think you will find the answer is probably none, Giggs has done nothing to court celebrity as far as I'm aware, he did not court the press or seek their attention, he sought to prevent a media scrum around his home and family and he was attempting to stop a previous sexual partner from allegedly extorting money from him under threat of publicising their relationship. Whether you agree with the fact he was cheating on his wife or not, surely you agree that he has a right to a private life.
Consider the flip side of your positions, if the media suddenly decided you were a celebrity then camped outside your house, rang the door bell all the time, followed you around, interviewed and investigated your friends, family, colleagues, hacked your electronic communications and paid your former partners for the prurient details of your sex life so they could publish it for the world to see, I think you would very quickly find that you would want the protection of the law to prevent them from harrassing you.
The attitude of the tabloids in relation to this is risible, all they want is to peddle their kiss and tell bullshit, you'll notice that they are all visible by their absence whenever "voicemail hacking" is mentioned, they were no where to be seen when Trafigura obtained a super injunction on a matter that most deifintley was in the public interest, yet they insist they have a right to publish details about the private sexual activities of consenting adults.
The worst thing is that the halfwits on twitter are playing right into the hands of the tabloids by breaching injunctions, wouldn't it just be fabulous if someone decided in the name of free speech to out Mary Bell's new identity or her daughters, or the identities of Robert Thompson and Jon Venables. There is a reasonable use for privacy injunctions, they prevent the worst excesses of the tabloid press who have all the moral judgment and common sense of a rock.
The tabloid press...AKA... hypocritical subhuman fucking scum.