Try flipping your thinking around race. Would that be the case if Lebanon had effective armed forces to call on? Ditto for the various invading/infiltrating foreign armies and the ghastly sectarian militias they've had to endure
Any increase in arms to Lebannon only has one outcome.
Saudis and France got bloodied in Syria so now they starting it again in Lebannon, which needs this like a hole in the head...............
Saudis paying back France because it wanted to start a war against Iran.
France aim is to attract the billions of Petro dollars that are flowing around from GCC.