Sure.
Judgy person observes people with different morals than them.
Empire falls.
Judgy person says "hey, it's because of the decline of morals" regardless of whether or not there is actually a collective decline happening and/or was a causal factor.
You create your own convenient narrative to explain the world around you but there is absolutely nothing objective about this. Can you confidently name an empire that fell because of moral decline? I mean, I know you can say "Rome" or something, but how on earth does anybody know their morals collectively declined?