Is France particularly vulnerable to terror attacks and is there a reason for this?

Why, for the second time, Paris has been attacked by the Islamist terrorists? Is France uniquely vulnerable to these attacks?

Ironically, one of the reasons for the increased attacks is the military successes France, United Stated, other countries and local fighters are scoring against ISIS’s core in Syria and Iraq and the consequences suffered by ISIS’s key provinces such as that in Libya.

ISIS, which had long trumpeted its success in establishing the now-shrinking caliphate, needs victories to compensate for these major losses.

The another reason why specifically European nations face several types of terror threats from ISIS is unprecedented number of fighters—more than 5,000—that Europe has exported to Iraq and Syria to fight under the banners of ISIS and other jihadi groups.