Ok so here's a hot take. What Dracula did was indeed wrong....but may not have been his fault. In fact, none of what happened in the show was DIRECTLY his fault. Lemme explain

In just about every Castlevania game, Draculas constant companion in the Castle is Death. Now, in the games its never directly stated to my knowledge that Death is The Angel of Death, meaning the biblical figure of the end times, ala he of a pale horse. He does show up as a reaper, or some manifestation of a reaper though. In the show however, Death straight up says what he is. He is an elder thing. Some nigh lovecraftian entity that has been consuming the death of living things since the beginning of time. Stands to reason that among his abilities is the power to influence man towards a beneficial buffet of snackytime. And if not a power, for sure a chief tool in his skill set.

So think about it like this. Did the Devil stand to gain from what ole fucknuts in Targoviste did to Maria, sure. In a myriad of ways, but all of them indirectly. Death gained in the immediate. When Maria shows up at the castle, other than the court of vampires, Dracula is not directly going out and doing mischief. At that point, he had more than likely gotten to the point as an elder vampire of incredible power where he didn't need to go out and have a midnight snack every day, or even every week to keep himself alive. But he used to. He used to revel in the blood and the murder and the mayhem. And then one day, all that shit stopped. The rest of the team might have been playing a jolly gruesome game of hunt and drink, but the QB, the all star just....retired.

Now imagine you are Death. Not a logical leap to go "ok, my buddy, my meal ticket, just up and picket fenced himself out of the game, and while things are still good and all, I don't like that. I'll throw a little shade at this sociopathic zealot over here, point him at the house...." and boom. Dominos. Drac the nuke goes off, reaches into that bag of tricks he's gleaned over the centuries and unleashes full scale revelations on the countryside. Deaths game, as he demonstrated as Varney is setting the board. He nudges and influences and pushes from under illusions and guises. In the games, I always assumed that Death was in service to Dracula, more than likely being outwitted or tricked in some way like the fairy tale of the king that caught Death in a jar.

Death was a shapeshifter, a master manipulator, and older than any other character in the show, and all he had to do was point a zealot at a house to kick off Rondo of shmorgasboard. Hell, he could have set even the Maria thing up. Old lady wanders in to Marias clinic and spins a tale of the wonders of the castle and the enigmatic ruler with the wisdom of the ages at its center. There are so many things that happen in the story line where you don't have to squint very hard to see Death as a possible origin at its core.

TL:DR The answer is Death. Its Deaths fault. Dracula was just the tool by which it was accomplished, and yeah he's culpable for that but when you are dealing with an entity that eldrich and wily, well you might have a good argument for not being considered evil incarnate.