And also, the problems of a subsociety for the wider demos comes not only from the fact that the subsociety exists, but also how it defines itself : Is it collectively attempting to define itself, segregate itself, and consciously improve its lot in society as opposed to the other subgroups ?

For example, typically in France, academics are defined by "having a PhD", which is more or less attemptable by everybody, although being from academic parents help ; so the maintaining of a subsociety is not conscious. Secondary school teachers in France is one of the group most adamant about not forming subsocieties, indeed.

Compare to what counts in France as the haute bourgeoisie, which consciously creates a segregated education system for it kids, enforces marriage within the class through social disapproval, and is able to get members of the class in the Elysée.

Compare to a mythical muslim subsociety which would only vote for communautarian parties, which would send the kids to private muslim schools, and whose women would be practically unable to communicate with the outside society because of the burqa.

Obvious reasons mean that Sarko denounces the mythical later subsociety rather than the earlier one...

Un roi sans divertissement est un homme plein de misères