This is pretty big.
Hard to deny this -- they always project what they're doing. It's as if the devil requires it of his followers -- part of the demonic code of pride or something.
Like the Ferengi "Rules of Acquisition".
Based on lectures on spiritual combat, yes, the prideful element and sense of shame exists amongst demons, as testified by reputable exorcists.
Keep thy spiritual weapons of war honed and ready.
As for other material manifestations of Mephistophelischsten malevolence…
If it bleeds, we can kill it. Until then, get to the chapel!! Get to the chapel!!