Common sense is not a flower that grows in everyone's garden. Do you learn common sense or are those whom have it gifted? Sometimes it seems more like a curse for those whom have common sense. We have to deal with those that don't.
A guy I know, invited me over to his room, and didn't even have the courtesy to tell me he was sick. He then made a "god" comment, I interjected and said I don't believe in god. He then said I was lost. I left right then. The next day (yesterday) I woke up with sore throat. Today, I went to the doctors and got some medicine prescribed. Mucinex and saline spray. I later asked this guy if he was sick. I asked him to be honest. He replied with, "Yeah."
Obviously people without common sense are never fun to hang around or talk to. Would they be considered ignorant then?