Quite possible.
In support of your observation about seeing "policiers" in France who are not white, I would recall that story about a Jewish person at a soccer match in France, who was pursued by a group of French skinheads. A French policeman - who was black - took charge, and shot one of them dead.
Quite complicated politics of race in that scenario.
In these latest killings, it is notable that Sarkozy and others hastily said that the killings were 'not political.' They seem to know something about the background to events. Just speculating - my own view is that this is happening in a region with a very distinct culture. In the south, various types of vendettas and honor killings are well known. If some local has a grudge against the Paras, this might be his way of settling the score.
Vendetta...you may be correct. But I suspect this is Islamist terror activity to discourage young Muslim men or young men of color from joining the French military.