Upvote:10
First, Jackson was within his rights. My recollection (of a piece I read years ago) was that when Jackson's pistol misfired, it was Dickinson's second who forced Dickinson to stand for Jackson's second shot, which Jackson was allowed, under the rules.
My further understanding is that both Dickinson and Jackson violated the "unwritten" rules; that in a duel, the need to preserve one's honor required one only to shoot to wound, not kill. (And even firing in the air was acceptable, especially if it was "close.") Dickinson violated that "rule" by shooting close enough to Jackson's heart to kill, and missing by a fraction of an inch.
After this, Jackson was not inclined to grant Dickinson any mercy, especially since the duel was fought over Dickinson insulting Jackson's wife. But pro Dickinson people (the majority in this group of "locals"_ were understandably mad that Jackson shot to kill, even though Dickinson had done the same.