Murder is sinful in Islam. There is a very long and ongoing tradition of Muslims serving in the British Armed Forces. Suicide is sinful in Catholicism. A high proportion of Catholic traditionalists is of what used to be called Not The Marrying Kind. Make of those facts what you will. But they are the facts, whatever we make of them.
The French Far Right has always been very split between the reactionary Catholics (who see themselves as simply de Tradition, but who in fact are not), and the Odinists and the like, such as Dominique Venner. Perhaps this is the point at which they can no longer stand each other, when one side raises a man to the status of a hero and a martyr for having committed suicide on the High Altar of Notre Dame? All sorts of things would then follow. It has been a long time coming.