I don't get the main point of that last post but maybe that's not surprising considering who wrote it?
In any case, it is true based on my own observations in life and all that I have learned, that people either don't believe in Hell or don't believe their sins are bad enough to send them there. Maybe their neighbor's sins are bad enough, for sure, but not theirs.. Oh No, certainly not!
So maybe this is what Jesus meant or part of what He meant when He said "they know not what they do"
They don't know how hideous Hell is. If St Faustina is correct in her Diary 741--- No one on Earth ever spoke about Hell that way (oh wait, maybe other saints did. There are a lot of saints who warned that few make it to Heaven).
A lot of people joke about Hell, saying dumb stuff like
I'm going to Hell because all my buddies will be there
Well, it doesn't look like you and your buddies will be doing much partying there
