This wasn't just Prince Harry or celebrities who were victims of phone hacking, it was ordinary people who weren't prepared for such an industrial violation of privacy and sheer decency from multiple newspapers. And it went on for decades[1]. In one case the mother of a dead teenager thought her daughter was alive because her phone's voicemail was being accessed. It turns out that The News of the World was doing it, it was such a widespread thing. And I'll never forgive the Conservatives for gutting the Leveson Inquiry[2] which went neck-deep in exploring how much of a mess the industry was.
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The sad thing about the court finding that Piers Morgan knew of the phone hacking is that it'll do nothing to him. The man is mired in decades of scandal and certain connections he made allowed him to bounce back every time. That, and the tabloid industry has an incentive not to act against their own lest all their dirty secrets get out there.
I could talk about Morgan all day, but I'm still in awe at how we let him recover his career after 2004. He put British soldiers at risk when he published faked photos of British soldiers torturing Iraqis, and when they were found as fake, he outright refused to apologise for it and got fired. That ought to be a career-ending move, but having connections with Murdoch lets you get away with anything.
[1] https://en.wikipedia.org/wiki/Overview_of_news_media_phone_h...