I don't think we should recognise his motivation at all. Who cares what was in his sick mind anyway. 
Egomaniacal psychopaths are all the same, radicalism of theirs only leads to suffering and pain of innocents.
If there is a lesson to be learned from all this madness, it is to stay unaffected and give zero care about that "man".
Cold blooded murderer deserves nothing else than cold dark cell for the rest of his miserable life.

Stop making stupid people famous, rarely is more adequate.