The murder of Lavoisier is one of the most horrible outcomes of the French Revolution -- which was generally horrific, mass drownings [1], Reign of Terror (the word 'terrorism' comes from this episode in French history[2]) and whatnot. That is what I think about on Le Quatorze Juillet.
[1] https://en.wikipedia.org/wiki/Drownings_at_Nantes [2] http://www.etymonline.com/index.php?term=terrorism