Whether or not Deschamps had a final say in the decision is speculation at this point. We do not know that he didn't give the green light and/or participated in making that decision. I would say he has, and I would say if Benzema wasn't a star player he would have been frozen out long before the Valbuena case.
Yes, France has a problem with immigration, assimilation, racism and what not, but IMO they do not have any of those problems in top level football(i.e. the big clubs plus the NT).
Btw, I don't agree with the decision, I think since he hasn't been charged with anything, a decision like this should not have been made. I just don't believe the decision has anything to do with pressure from racist groups, or any of the BS Benzema spouted. I hate those who play the victim card at every turn, and Benzema especially is everything but a victim here.