If they were North African and Carribean, it is quite possible the men were not white. When I visited Paris, I saw more than one millitary policeman at the airport and train stations that were most definately not white.
That being said, the most likely scenario in my mind is a muslim terror group taking the war in Afghanistan to the home front and targeting military persons. Of course, the far right wing in Europe is a real different animal than the far right here, so if these troops were not white, that could have been why they were targeted. And you cannot dimiss the hard core left being behind this, as Euro-commies have a long history and predisposition for using violence to make a statement. I would put the last two groups ata distant second if I am thinking about perpetrators and motivations, though.
That is not my question. Why when a white kills a non-white it’s racism but when a person of color kills a white racism isn’t mentioned?
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.