The consequences of excessive hospitality, self-deprecation, and attempts to play nice and responsive people. Plus the manipulation and attempted internal pressure on Macron by his opponents.
There's a bunch of stuff mixed in there, from primitive idiocy to elements of geopolitical gamesmanship.
If you take the "grassroots" problem - the games of "tolerance" to immigrants flooding France - that was the foundation of the problem. About 15 years ago I flew through France, Paris, De Gaulle airport, and had time to walk around Paris. No offense - I did not see a single "emigrant" who showed any benefit to the country that gave him shelter and the benefits of civilization. They were all consumers, all were quite aggressive towards the local population, and did not give a damn about France and its laws. I was then talking to acquaintances who lived in Paris, and to my statement "soon they will be a huge mass, which already considers France as their land, and you MUST HAVE THEM, do you want to start pre-emptive measures to take", I was told - "well what do you say!? they are people, they suffered there, we are civilized people, they will adapt and become full citizens of France". I laughed back, they were offended
It turned out I was right...
I beg to disagree with you on the issue of "benefits from the immigrants"
I think to a large extent, France has benefited immensely from immigrant population, ranging from a young protective work force. Take a look at France national football team, it depicts to a large extent to which they've benefited from immigrants. However, there might be one two Judas within the immigrant population, but that doesn't make the problems squarely lie on them.
I'm going to have to disappoint you. Young French national soccer players could get visas and "work" for France. But the statistics say the following - out of 100% of emigrants, about 80%+ of emigrants are welfare and welfare recipients. Of the 100% of emigrants to whom France, in a hospitable and friendly way, has provided much better living conditions than in the home country of these emigrants, about 65%+ are criminals and antisocial citizens. You still want to talk about soccer?!
Or maybe you want to talk about statistics , for example - the harsh, mostly deserved, police treatment of criminals, not emigrants ? Or just statistics about how many crimes emigrants commit in relation to the number of crimes committed by natives? Or let's talk about - why tough detentions against the local population - no one causes acts of total aggression, looting violence and destruction of private property, except in cases of legitimate use of force against emigrants ?