I find this concept so far from my reality that I always contribute something sarcastic on the threads... but it made me think, AM I in the minority? Is this an actual thing ? Personally I would NEVER not answer the door... is this because I live in a quiet village in the Highlands.. or because I have scant regard for the worst of human kind...and will come a cropper.
YANBU = I always answer the door , why would I not
YABU = It could be someone wishing to do you harm and not worth the risk, be it a parent , parent-in-law, psychotic axe murderer...
Age would be helpful to understand this mindset (but not essential obvs)