About 30 years ago I took a class in which the thesis was "Which shall preserve for the future the image of man" and we read 3 debates (6 papers). At the end of the quarter we had to write a paper--that would be our grade. So, I sat down to write and it immediately hit me "Hey, none of these guys defined their terms!"--which means that none of us had noticed it all quarter long! So, I told the prof and on the basis of that observation and class participation he gave me a B. Two week later, I happened to notice that others had written the final paper but hadn't picked up their papers. So, I took a looksy and found that my neighbor hadn't picked up her paper. So I brought it to her. She was not a happy camper and asked "Did you read it?" and immediately confessed to what she knew I already knew--she had written the paper the night before it was due off the top of her head--she knew me well enough to know that while I can't express myself too well, I can read a paper and tell you what is going on behind the ink and paper.
So, when someone slugs you in the mouth and then says "BTW, I'm sorry for trespassing on your lawn yesterday" would you believe them? Nobody asked for "grovel," just sincere would have been nice.