Think about it...
All the pictures of the empty city streets in the early 1800's are taken during the day. Vampires would be sleeping, accounting for all the empty streets. (Can vampires be photographed? Probably not if they don't have reflections.)
Vampires would produce better art and architecture, since they'd be able to master their craft over multiple lifetimes.
It also explains why Tartarian buildings had no bathrooms. Vampires don't poop.
Orphanages? Maybe the Vampires had farms where they raised human children for food, and after the Vampires were slain, the liberated livestock needed to be rehomed.
Or maybe the Vampires weren't slain at all, and they just moved into underground cities where sunlight wouldn't be a problem, and now the entire surface world is one gigantic vampire-controlled human food farm!! Yikes!!! (That would explain why nobody remembers - it's goddamn vampire hypnosis!)
I don't think vampires as portrayed in fiction are anything close to reality. Perhaps a symbolical representation of something present, that yes
But i often think there must be a functional equivalent to that.
Our society is too much being pushed in the way of the °time machine° society, lol
It's an allegory for the elite feeding off of the lower classes. Unfortunately, there is a large group of people who read certain books and think allegories are documentaries. Somehow they've infiltrated the conspiracy community, despite actively participating in one of the largest and oldest conspiracies to exist.
Those dang book readers always messing things up. Stupid enough to think an allegory is a documentary, but smart enough to "infiltrate" and subvert.
This is a funny thought, but I don't think so. I do wonder why the buildings exist with no human remains, but it must be something else.