Apart from the extremist mindset and ,Global agenda of ISIS ,these two main factors are the key in understanding the hatred of ISIS against France.
The satirical weekly magazine goes over the board in the shed of freedom of expressions .On two occasion Charlie Hebdo turned blind in the obsession of mocking Muslims most loved and respected figure Muhammad PBUH ,in doing so they received two terrorist attacks one in 2011 and second in 2015 ,in which 12 people were killed, including Charbonnier and several contributors.
No justification of killing of innocent people can be given but ISIS believes that killing french is now their religious obligation.So that act of Charlie hebdo might well have cost more lives than we know.This prespective of hatred OF ISIS must be understood to properly eliminate their terror threat and barbaric killings in France .
There is no doubt that France is very active NATO member .Apart from USA ,the french troops are in the largest presence ,and after USA their planes are more than any other European country.The Opération Chammal is the name of the French military operation, which is currently battling in Iraq to contain the expansion of the Islamic State of Iraq and the Levant the ISIS and to support the Iraqi Army.
So its easy to understand why ISIS is so angry at France .
What should France do to protect their citizens and keep promoting their military agenda ?