Vergil has 3 games and a manga (not counting non-canon novel with Gilver) where you get to see a glimpses of his past and motivations.
Vergil was only present as himself in one game though, DMC3 - Nelo Angelo was a poor husk of a man in enslavement, he wasn't in DMC2, and DMC4 only mentions Vergil as a brother and it's way more about the Yamato than Vergil. DMC3 was the one chance they had to expand his character so far.
The manga is also of dubious canonicity because it contradicts many things in DMC3, plus it's unfinished, throwing so much up in the air
The only things that can truly be considered canon are the games themselves, and even then the narrative gets slightly jacked :/
Don't ignore all that information just because you don't like the character. Use educated guesses to fill in the blanks, because the games have never been story focused and they are never going to explain it all for you.
I'm not ignoring anything. It's just that most of what is ever proposed is literally just theory and assumption that can't be put solidly. Educated guesses to fill in the blanks doesn't truly fill in the blanks, because it's our guesswork that's filling in actual blanks.
You can't excuse a one-dimensional character simply because you can assume a lot about them - the fact that you have a lot to room to assume about the character is actually a bad thing. Great for discussion and theorycrafting, but bad for the character itself.
The quote was more about himself than anything to do with his parents.
That's something I've been saying this whole, all of Vergil's motivations come off as wholly selfish. There's nothing in the game that provides incite that he does what he does for something else, or some greater cause
-Vergil wanted power by any means, but he lived through a code.
- Though evil, Vergil has shown mercy on the innocent or the weak.
-As Nelo Angelo Vergil would not attack someone from behind. Which means, his code of honor is embedded into his DNA voiding any alterations that were too weak to hold them at bay.
-Vergil reads to gain knowledge and uses this knowledge to help him in his quest for power.
-Vergil doesn't show fear towards anything.
-He sees guns as weapons suited for the weak, not for a warrior.
-Vergil has no tolerance for failure nor insubordination.
-Vergil is capable of listening to reason during heated moments.
-Vergil dislikes alcoholic beverages, but still accepts a challenge from Dante, loses and swears off of it. Dat rivalry complex.
This entire thread is based off of what we all know about Vergil from each and every story he's been in.
To be quite frank, Vergil didn't have as much honor as everyone likes to think he does. People seem to associate his Samurai-like demeanor with some sort of code of ethics, but Vergil has killed for such petty and dishonorable reasons - he kills an unarmed Arkham because he's just done with him. Hell, he gave zero sh!ts for all the people in the city that he put at risk by raising Temen-ni-gru, too. He's not an honorable man.
Having a code of conduct when it comes to battle, however, like not wanting to use guns, is just something he feels strongly about - proving your worth through your own power. Hey look at that, we're back to power again >.<