A historical question

Rating: 9/10 (9 July 2012)

I loved the movie but there seemed to be one scene that didn't ring true. It is regarding the treatment of Jews during the Nazi occupation of France, so I would appreciate any input from French or Jewish readers or World War II buffs especially cognizant of that era. After 4 years of Nazi occupation and the pro-Nazi Vichy government under Petain, who gave free reign to the Gestapo to do whatever they pleased, wasn't it pretty obvious to the remaining Jews that they had to hide to survive? Why would that elderly Jewish man be sitting there in broad daylight in a public restaurant frequented by Nazis? And why wouldn't the priest have warned the Jewish child not to go into the town much less go to a public restaurant?
In another film about that period, Francois Truffant's "The Last Metro", Catherine Deneueve's character Marion Steiner hides her Jewish husband Lucas Steiner in the cellar below her Paris theater to prevent him from being arrested by the Gestapo and sent to a concentration camp and certain death. That movie was set in 1942, two years before "Au Revoir Les Infants". Which is accurate?