The quality debate about scientific merit aside, if the U.S. wants to remain "the best", then we need to incentivize the best scientists and researchers in other countries to come here and become U.S. citizens. A lot of famous physicists, mathematicians, and logicians have done this over the past 100 years. Unfortunately, the attractiveness of becoming a U.S. citizen is waning because (1) current U.S. policies on sci…
When the French executed Lavoisier, they said "the republic needs neither chemists nor scientists". The US seems to be of a similar mind at this point in time.
You are talking about an event in the Great Terror (https://en.wikipedia.org/wiki/Reign_of_Terror), when thousands of people were executed by the Committee for Public Safety, both on the left and the right, as Robespierre descended into madness. Towards the end, he set up a festival in which he invented his own cult -- the cult of the Supreme Being, and posed as moses carrying the revelation of the Supreme Being from a mountain. That really started to freak people out.
Pronouncements from that era are not representative of French culture or thinking even a few months after the terror. For example, Napoleon was a great patron of science.
BTW, a fantastic source on the French Revolution is the revolutions podcast -- they cover it over 53 episodes
http://www.revolutionspodcast.com/
One of the more poignant episodes towards the end of the Great Terror was when, in one day, they executed a group of nuns whose only crime was living together communally, and a 16 year old pickpocket. Whereas before, the citizens were cheering on the Guillotine, towards the end, when the boy was beheaded, someone from the crowd shouted out "Please, no more children!"