I think it's like watching a play - you have to buy into the symbolism and emotionally connect to it in order to be moved. You know, from your seat on the balcony, that you are looking at props, actors saying lines and understanding a context which stands for something greater. With royal events, you suspend cynicism.
You can say after a play: "But that was a plasterboard wall which somebody wheeled off, and it was that man from 'Killing Eve'," but it's actually perfectly possible to enjoy theatre, if you have seen a few live plays, when at school and got into the hang of it.
Sure, for some the theatre experience may be alien. But it's disingenuous to express that it's inconceivable how vast numbers of people can join in official mourning for a monarch who played a symbolic role for 70 years.
Even the Christmas Day message was meaningful. Royalty visited Grenfall and, before that, Aberfan. They did connect events to meaningful reflection and they did mark what was spiritually important to people.
We have so much celebration and fuss over sportspeople and their achievement, that it's obviously within the human psyche to go a bit wild on occasions: it's within the range of normal, rather than being batshit.