I think they were not afraid of terrorism or cops but rather journalist.

This past few years several documentaries showed how bad hygien can be in some french restaurant (fast-food or not) wich in the worst case led to the death of customers. http://www.leparisien.fr/faits-divers/quick-d-avignon-benjam...

One of this documentary was involving macdonald but was only broadcast on the internet once it was leaked cause the channel didn't want to lose one of the biggest advertiser. http://www.slate.fr/story/19421/mcdo-kfc-le-reportage-censur...

So i would bet they were afraid of bad publicity ... Oh the sweet taste of irony