First, my deepest condolences to all the victims and their families in Paris, this is an absolutely horrible act of terrorism and there's no denying that. The perpetrators deserve the harshest punishment possible for this crime.
Now, addressing the argument in this thread:
All things terrorism all things islam, basically.
(I'll speak from the viewpoint of a former-nominal-muslim (muslim in ID only--yes that's a thing where I hail from) turned atheist turned agnostic turned IDGAF-I-just-wanna-make-decent=living and as long as I live here I'll just do all the things that "moderate" muslims do to smoothen my business/startup until I can live abroad indefinitely).
You're simply generalizing here.
Most of my families from my mother's side are muslims (my granny is a devout muslim--we're almost always at odds when it comes to adherence and devotion to religion, but we're cool and getting on with it), and most of them don't have radical stance when it comes to Islam. In fact, they're more like your usual Christian moderates/conservatives (i.e., not Westboro-Baptist-ish), or even, among the younger populace, simply secular/don't-care about it as long as they follow their civic duty to hold a religion, in this case Islam.
That said, about three or four people I know do hold radical view bordering on your familiar /pol/-based view on Islam (taqiyya, thaghut-fighting, USA-hating, you name it). Heck, this is true story, I swear in the name of my hospital-bedridden Granny's name: I once was about to be recruited as a member of the Islamic State of Indonesia back in around 2009; and that's when I found that this is a complex, multi-layered issue, this is a truly grey area--with sound theories and crackpot conspiracies intermingling almost beyond distinction. Even until now I can't really put my hands on what causes some people (who claimed themselves as muslims and following the teaching of Qur'an) to resort to acts of extreme violence.
What I can add into the discussion now is merely that I truly believe that there need be serious reinterpretation on the sacred texts done by foremost muslim and non-muslim scholars alike. Reformation is gradual, but possible if we can keep clear head when doing potentially-emotionally-loaded debates and discussions like this (though that's my idealistic side speaking, in reality, I doubt it will work out, at least not in a few decades)
Why do we need such reinterpretation? Because some parts of Qur'an (e.g., waging war with the infidels) are, indeed, prone to be taken literally, or be used as a pretext for mindless destructions by the desperates or the brainwashed. The result: people are beginning to throw the baby out with the bathwater--being religious, i.e., being a Muslim, for some people that I know in this country, gives them a purpose, a sense of belonging to a community that, however controversial, still can do good (providing healthcare, philantrophy) for many people. (I speak for the pacifistic kind of muslims, for the aforementioned terrorists, see my writing above)
I wish I could post more on this, but I only have around one to two hours a week for writing here, so I will stop right here and let the discussions/arguments roll on for now.