But to add some perspective on the situation in the UK here is our (surprisingly good) government data website: https://coronavirus.data.gov.uk/
As you can see, infections/day have been ~doubling every ~2 weeks for the last ~6.
And here is a letter in The Lancet from scientists opposing the imminent end of all restrictions: https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
A lot of older people aren’t ever out past 10pm (I’m in my late thirties and I rarely am!) and have been convinced by tabloid newspapers that youths/immigrants/criminals/[delete as applicable] are doing all kinds of awful things at night time. Best to keep everyone indoors so that we’re all safe, eh?
Now, a curfew sounds drastic, and I suspect many people are saying they are for it tongue in cheek. However, what's wrong with wanting to keep some of the positive aspects of the last year? Why go 'back to normal' when we can go forward to something better?
Not saying it's really desirable, worthwhile, or even feasible... But that's probably why some want it. Some places get pretty unpleasant after dark.