As-ever, it all comes down to the presentation of these things. Maybe those mortal souls are from the true believers of her cults who willingly gave themselves over to the rightful champion of the yozis? Maybe they were the walking-wounded of her legions who wished to be immortalized as one last display of usefulness towards the cause? Its all just another form of hoarding what is Yours and no one else's.
Ultimately though, using "decadence" as a by-word for "bad guy" inevitably falls into equal parts cackling evil and over-the-top theatrics anyway, because even the word "decadence" is hinged on the idea of an objective measurement of moral decay and debasement of the self and others in the pursuit of unnecessary excesses. All I pointed out was a Lack of excess involved. The specifics I tossed out aren't really the point of the argument insofar as the message being sent, that her "thing" is how she expresses social and physical power over people needlessly, enough that she owns and treats them as objects.
And sometimes that can be extremely literal.