Earlier quoted context omitted.
France had no problem supporting the conflicts in Libya and Syria that sought to accomplish similar outcomes as in Iraq (remove & replace Gaddafi and al-Assad). In fact, France has routinely urged Trump and the US to remain engaged in the Syria conflict. "Emmanuel Macron to urge Donald Trump to keep US in Syria during White House talks" https://www.telegraph.co.uk/news/2018/04/23/emmanuel-macron-...
Both Libya and Syria conflicts were started by their respective dictators massacring people.
You don't see France egging on the US to get militarily involved in Venezuela for example. What's going on there is a human disaster of a similar scale as Syria, with the Maduro dictatorship brutalizing and starving the people, and millions fleeing the country. There is rarely a shortage of civil wars and other assorted internal conflicts to get involved in around the world. So why is France specifically so amped up to keep the US in Syria?