Just before the first lockdown, I heard someone shouting out on my usually very quiet street. I went upstairs, opened the window and looked out. I could see it was my elderly neighbours two doors down needing assistance, so I went down and over to theirs to see what was wrong (a passing car also stopped so I wasn’t alone).
They’d opened their door to someone knocking, who then barged in and stabbed the man’s hand to get his watch off, among other things, before running off. The people who did it went on to hit three more houses that evening, same pattern. All relatively early evening, but dark, like 7pm approx.
Basically, hell no I do not open my door to anyone knocking. Maybe during the day, but even then am very cautious, and happy for my second porch door which I try to keep locked after dark.