Thank you. So research for "private" purposes is possible and lets say that in politically correct place such as France there still something as genuine as mainstream, left or right wing newspaper 
You're welcome. And you seem to think right and left aren't real political notions which makes already a difficult point on which we don't agree ^^Quote
So muslims make up 8% of french population, yes?
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Can you then also find some information why 60-70% of imprisoned people in France have muslim beliefs? Do inmates convert en masse while in prison or is muslim population far more likely to clash with law and order?
Here a little reading:
https://www.adamsmith.org/blog/are-70-of-frances-prison-inmates-muslims
To sum it up: the number was from a right winged "sociologist" but even himself NEVER SAID 70%. His estimations are of 40% to the max and every other figures say about 25%
So I'd explain it simply by saying that if you have ONE and ONLY ONE study in the world that gives a figure and all the others that give another.... I'd say the first one is false ^^
But don't misunderstand me, 25% is still 3 to 4 times more than the 7% of the actual population. And so?
Well, the thing is Washington Post is liberal left media, why would it spread panic and share information that is not independently researched?
You use the term "right wing" as synonymous for insult, but I understand, that you are one of the few actual french speaking people here. Le Pen is called "right wing" and her program is leftist if I ever saw one.
"Left wing" in Europe is synonymous for elitist today.
Thank you for clarification.