Spoilers
I think the point was to build up the French guy into this proud and honourable guy who ultimately fails as a damning result of the "jew hunter"'s ability to find his quarry, and break anybody who attempts to stop him. The idea of building him up immediately by pitting him against even the most stubborn of sideline characters is much more effective to me than just having him shoot a bunch of people who were harbouring jews.
I think the point was to build up the French guy into this proud and honourable guy who ultimately fails as a damning result of the "jew hunter"'s ability to find his quarry, and break anybody who attempts to stop him. The idea of building him up immediately by pitting him against even the most stubborn of sideline characters is much more effective to me than just having him shoot a bunch of people who were harbouring jews.