I don't quite get your argument.
The argument is that many people face threats, but they don't get their own bespoke armed police escort, much less take legal action to demand it. Unlike Harry, who lives in California and plugs a coaching app for a living, MPs are resident in the UK and are public servants. And even they don't get their own armed police bodyguards, or even, in most cases, any kind of security at all.
In Harry's case, I'm not sure how far more serious you can prove people are, other than them getting convicted by a court of law. It has already been reported that he has had several threats since being with Meghan, but it's been proven that some of those are not idle.
Do you really believe that RAVEC, the expert body tasked with such matters, is not aware of this freely available information, and will not have used it in their assessment of Harry's risk profile?
RAVEC, who are in possession of vastly more information than you or I, have said that he will receive protection on a 'case by case' basis. I'm not sure why that's not good enough for him. After all, he seemed perfectly happy to mingle with thousands of strangers in Los Angeles without any FBI protection.