OnlyLibingBoy - I think I have explained, but I think it’s the case that some people simply refuse to understand, rather than are unable to.
It’s very simple really. As I said, I can’t speak for the entire nation, but I think for most people it’s a formality these days. Nobody is expecting a “no” and if they were, they probably wouldn’t be asking!
In our case, my parents had only met DH twice as they live abroad and we’d only been dating about 6 months. When they were visiting London, DH went for a walk with my DF under the guise of showing him some certain pub with whatever beer. He told him he was going to propose etc. I don’t really know what they said exactly. About two weeks later, we were on holiday and then that was when DH proposed. When I said I should ring my parents, he told me he’d already spoken with my dad and reassured him about everything. So that was it. Anyway, my parents were delighted and less worried than they might have been otherwise.
My dad would not have said “no” unless the guy was a psycho. If he was worried, he would have come to me. But I think he appreciated the gesture and it made him trust and “bond” with DH more. My mum was also happy and felt more part of the wedding.
We have relatives on DH’s side who are younger than us and who have basically have had arranged marriages in the modern sense. Again nobody is forced into anything, but parents in a certain community talk - “My nephew is a barrister aged 35,” or “My cousin is an optician aged 32,” etc etc. They meet at family events and if they hit it off, they start the ball rolling. This happens a lot, but people would not necessarily realise.
So people are coming from different perspectives. That’s all really. I don’t think it’s that hard to understand.