People imagine they’re in a relationship with the queen, who was one of the wealthiest humans on the planet, with an arguably unparalleled status and prestige.
This parasocial relationship makes people feel they’re part of something greater than themselves, because on some level they recognise that their own lives are worthless and pathetic.
I think this is the basic mechanism for any sort of celebrity worship and fandom, though I admit haven’t read much literature on this particular topic.
All people look for means of boosting their self-esteem, in the UK, the options are rather limited for most people, because it’s a miserably classist nation, with high levels of inequality and poor social mobility, where most of the ordinary and relatively poor population are kept hopelessly demoralised and hooked on football, long-running soap operas, celebrity worship, and often worshipof the nation-state and the monarchy.
What really struck me was the euphoria of the people who queued for over 12 hours to see her coffin. One woman descibed it as the greatest moment of her life, and even better than giving birth to her own children.
Of course, the media plays a huge part in promoting all this and indoctrinating people, and the British media is, I believe, the most effective propaganda system in the world. It is the most viciously partisan, obsequious, relentless propaganda arm of the British ruling class.