How did French and German security services overlook Strasbourg 'radical Islamist'...

They didn’t overlook anything. They were obviously paid off by George Soros and the Deep State globalists at the behest of the interdimensional clockwork space elves. Wake up, sheeple!

Cherif Chekatt wasn't overlooked he had been on the French terrorist watchlist since 2015. Seemingly what set in off was that the French police raided his home yesterday morning to arrest him for an attempted murder in August, he was not home but they discovered a grenade, a rifle, and four knives.

Now what is partially true is the French Security Services were shambolic in failing to notify other European police and security services that he had been radicalized and was on their terrorist watchlist.

The French and Germans are Keystone Kops. The French were actually good at protecting their citizens and deGaulle during the Algerian war but that was then and this now.

France has been protecting at least one convicted pedo for more than 40 years. The Germans messed up the Munich hostage taking.