Castlevania and Non-Attachment, Part One: Alucard and His Father
Ok, so Alucard having to kill his father is pretty much the main point of the first two seasons---obviously---and throughout those seasons, as well as the third and fourth seasons, we're shown that Alucard is incredibly pained by this fact and that it continues to hurt him long after his father is already dead...and yet, despite it causing him great pain, he still does it.
Well, because Alucard understands that his father is too far gone---he's hurting innocent people, he's taking things too far, and he's not willing to listen to reason. So he needs to be stopped.
Does this mean that Alucard doesn't care about or love his father?
Does this mean that killing him was Alucard's first choice?
We're shown throughout the show that Alucard loves his father and cares for him deeply, that he misses him and wishes that things could've been different---and we're shown very early on that Alucard tried reasoning with his father, but that his father refused to listen and only hurt him in response.
Alucard loved his father, but---in the end---he recognized that he couldn't let that love blind him from the fact that his father was committing atrocities and that he needed to stop him.
In a way, I think this story interestingly parallels Obi-Wan's reaction to Anakin turning to the Dark Side.
Alucard sees his father has done and is doing terrible things, and first tries to reason with him---telling him that it's time to end the bloodshed.
Obi-Wan sees the same from his former padawan, all the terrible things he's done, and tries to reason with him---asking him what he's done and telling him that Palpatine has lied to him, acting on the defensive throughout their duel rather than actually fighting him.
Dracula, in turn, reacts violently to Alucard's words---harming his own son, both at first and in their final battle, because he can't let go of his hatred.
Anakin, similarly, attacks Obi-Wan in the same way---constantly trying to kill him throughout their duel, despite Obi-Wan not doing the same.
Alucard then understands that there is no saving his father and the only way to stop him is to kill him, no matter how much it hurts to do so.
Obi-Wan, too, realizes that the only way to stop Anakin is to kill him, no matter how much it hurts to do so.
And so both Alucard and Obi-Wan make the killing blow*, putting their own feelings aside in order to save their worlds from monumental harm.
*Yes Obi-Wan doesn't actually end up killing Anakin, but he thought he did and the intent was there, so I'm counting it.
It's gut wrenching and painful, both emotionally and physically, but both Obi-Wan and Alucard both understand that protecting the lives of the innocent is more important than their love for one person.
Which is exactly what Star Wars is all about.
