It is irrational because you're scared due to recent events. You're proving OP's point.

You can't apply reason and logic to his going to Mecca, and arrive at a conclusion that he may come in to work with an AK-47.

It would be irrational to be scared of him just because he's a Muslim. For the record I have several other Muslim colleagues that are absolutely not worrying me.

I don't find it irrational to be scared of someone that shows signs of radicalization.

> So now I wonder if one morning he'll decide to come at work with an AK-47.

That is exactly the "wildly irrational [propaganda that is] being pushed 24/7 by the most powerful and richest entities on earth" 'adventured was talking about. Sadly, this kind of association is so present in our culture now that we need to work hard to stop thinking like that.

> And living in France, I'm sure you would agree it's not irrational to think that.

France is big and - like every country - mostly uninteresting to terrorists. Do you live in Paris?

> France [...] mostly uninteresting to terrorists

Seriously, are you uninformed or trolling ? The French wikipedia page [0] (sorry it's not as detailed in English) lists 8 terrorists attacks (3 failed attempts) for the year 2015. I don't want to become an interesting target !

> Do you live in Paris?

I don't and Hervé Cornara[1] didn't either.

So I'm not cowering in fear, ready to accept "fortress Europe" [2] however I'm legitimately (or so I think) worried.

[0] https://fr.wikipedia.org/wiki/Terrorisme_en_France#2015

[1] https://en.wikipedia.org/wiki/Saint-Quentin-Fallavier_attack

[2] https://en.wikipedia.org/wiki/Fortress_Europe

> Seriously, are you uninformed or trolling ?

Uninformed. Thanks for the links, I didn't realize there were more than 2 attacks in France this year.

English Wikipedia has a nicely formatted list[0].

[0] - https://en.wikipedia.org/wiki/Terrorism_in_France#List_of_si...

No you are not irrational at all. Keep an eye on him and better if you tip him off to the authorities so he lands on some watch list. Not shaking hands with females is a sign that he's become DEEPLY fundamental and it only would take him just a few steps up the Islamic ladder to reach the Jihadi level and starts viewing the world into two dominions; Land of Islam "دار الاسلام "and Land of Infidel "دار الكفر"

In the Western world, we generally rely on the fact that people are capable of compartmentalizing religious beliefs that are incompatible with liberal society. In the grand scheme of things, it works pretty well.