Seeing things that are not there has always been the danger of looking too deeply into things. I recall seeing some vaguely red, white, and blue lights on one of the necro doom towers. If you wish to take that as an American/Necromonger association, and hence a slight/condemnation, then go ahead. You can take it anyway you want to and It can mean anything you want it to. For me, the Necromongers are the Necromongers, and the only thing I note about the lights is the fact they don't look hideous or out of place.
On a side note, the irony that New Mecca, were there are many different people with many different religions, is conquered by the Necromongers in a 'one true religion' crusade is not lost on me.