His paranoia is now exactly like Diana's when she was in the throes of leaving the royal family (by divorce).
It will feel like an establishment stitch up, because it is, and with just cause. The establishment is there to protect itself, so that it can protect society in the UK (at least that's what the establishment tells everyone it does, but that's a different conversation for another day), and not specific individuals like Diana and Harry. There's a price to pay for everything: if you're in, you get privileges for your various 'deprivations'. If you're out, you're free to do as you please but you won't be getting any more handouts. Going from in to out can't be a pleasant experience.
Diana and Harry will both have been denied access to information, both have been on the receiving end of diktats that they couldn't question or challenge, kept in the dark about various things etc, all by the men in grey suits who were working for "them", protecting the people who are still in. When TLQ said no half-in/half-out, this is why: you can't know some stuff but not all, have some protection but not all, play by some rules but not all. You compromise everything by doing that, you're rocking the boat and upsetting the priorities of a well-oiled machine. So, if you're not in, you're entirely out - and that will feel like a premeditated stitch-up to those on the receiving end. Harry and Diana will both have felt manipulated into a corner, which best suits the establishment and will be at their expense.
So I think Harry gets this part of it - his personal, selfish, teeny tiny part of it - quite well. The rest is just him digging himself deeper into his own grave (hopefully not literally!). I can't believe he thinks his two "tours" in Aghanistan puts him on the same security footing as ex-PMs who have blood on their hands for having declared war resulting in the deaths of hundreds of thousands of men, women and children. I have sympathy with "I didn't choose this, I was born into it" but what nobody has time for is him not weighing that up with all the privileges which he was born to and which just aren't enough for him. As anyone on MN would tell him: our children are special to us and their grandparents, but really not at all to anyone else.