First, I like France, and I like the French. I don't like Chirac, and there are many French who share my dislike for the same reasons (which are not those for why the Bushies dislike Chirac and France).
Now, as for the case at hand, the following failures occurred:
A) A Continental Aircraft was repaired in a manner not according to spec.
B) Said continental aircraft repair failed and spat out the jagged piece of titanium on the airstrip.
C) Airfield Authorities, whose job it is to keep the runways hazard-free, do not detect said piece of titanium.
D) a Concorde, at or (probably) above RTOW rolls down the runway and hits the strip.
E) Due to a design defect, documented for over 20 years, the tire doesn't just puncture, it explodes, and shrapnel punctures the wing, setting it on fire.
F) Asymmetric thrust causes the aircraft to veer.
G) Maintenance shortcomings on the Concorde probably aggravate the veering.
H) PF, past V1, elects that damage isn't sufficient to risk a potentially disastrous overrun, and continues takeoff.
I) PNF, although not ordered to do so, shuts down the engine with the fire warning, reducing thrust further.
J) Aircraft takes off, struggles, and crashes.
A-I all involve problems. Some of them (G) may be red herrings, but they're all pretty serious.
Continental's role is pretty minor. The Airfield's job is to keep the strip free of hazards. The Aircraft design crew's job is to make sure that FOD missed by the airfield is not capable of inducing catastrophic failure.
With the Concorde, which has a history of nasty problems from burst tires, and which needs a lot of runway, it would have made sense to run a check of the runway before takeoff. Then again, if you have a hazard that's a lethal problem for only one type of aircraft, then the problem is with that A/C type.
There are a lot of Americans a french investigating judge could bring up on criminal charges. But if the maintenance folks for Continental are so convicted, then our friend the investigating judge would be convicting them as political prisoners, either for some personal grudge of collective guilt, or the even worse crime of collective innocence of his compatriots.