Oh for heavens sake isn't it obvious?
They now need lawyers because Harry and Meghan are selling and sharing personal texts, phone calls etc between family members with the whole world. As a bare minimum, putting personal ethics aside, it is a security breach and risk.
What else are the sussexes going to share? Security details, contingencies etc. They certainly can no longer be trusted.
Harry has breached the military code about body counts and put the whole country at risk/heightened security issues around personnel. Harry only now seems to belatedly realise this, and now has an 'armed' guard.
Of course they now can not directly speak or message the sussexes again, as it could be sold and shared publicly. Everything will go through the lawyers from now on so it can not be misconstrued or used against them.
This is not about garden parties, I was being sarcastic, this is about safety. It is about security breaches and recognising Harry is very dangerous and can no longer be trusted in any shape or form.
I fail to see how things can get any worse, thanks to Harry.