I’m thinking that it may not be the usual suspects, since no one was killed. Probably just a white guy in to wrap or something.
So this young man looks up how to make this stuff and then makes a bomb and leaves it in a public place. Off with his head !!
Motive ? Hard to say, if one rules out the usual suspect, ahem, ** Islam **, (not saying it is ), then he just might be a crazy bastard that wants to kill / injure somebody for kicks ?
Make no mistake, this device was made to maim and kill.
The bombing was a family enterprise.
The family are Algerian immigrants into France.
Algeria is 99% Moslim.
Connect the dots...