I can think of two plausible but simplistic explanations, there are no doubt more.
First, they may have been waiting for better timing. Once you drop a bomb on a building, the scum-lickers learn they've been exposed and will not return. So they want to bomb the building when it contains one or more high value targets. Knowing when a high value target is inside requires you to have an intel source observing the building (or the target) at the same time the target is in the building and you have assets in position to level it. That doesn't happen very often. But due to the attack they have to respond quickly, so they are sending a different message by killing a bunch of low value targets in a lot of locations.
The other simplistic explanation is intel gathering. Getting a spy into their organization is not easy. If you bomb a building, you are revealing to the enemy that at least one of the people who knows about the building is a spy; or that you have the capability of intercepting some kind of traffic. To preserve the secrecy of the ULTRA program that decrypted German Enigma traffic, Britain developed an elaborate process for destroying U-boats in WWII. They couldn't just fly to the location of the submarine and drop depth charges as that risked revealing the Allies ability to decrypt communications; instead, they scheduled weather-reporting planes to fly more missions in certain sectors; these weather planes would then "get lucky" and report the U-boat's position to the destroyers. Similarly, France may not want to reveal that they're triangulating cell traffic, or tapping certain phone lines, or monitoring PlayStation Call-Of-Duty chat rooms.
Either way, France is trading potential future intel gathering capabilities to send a message today that says "you are not invincible, you are not right, you are not just, you are only vermin to be exterminated." They can rebuild their intel network later.