yes but he didn't utter a single word when dante asked "what are going to do with all the power" that silence indicates it could be nothing he is blindly driven towards powered without any forethought or plans he just "wants" powers imagine what would he do if he gets it ? he would want more and more power resulting in a super evil vergil
I don't disagree with the thought that in the end Vergil didn't even have plans of what to do with his power.
Neither do I disagree that it's really
possible for him to become super evil after acquiring it.
I'm not saying he's a good guy. Just that he wouldn't kill Dante without a reason.
I think in that final talk between them in Devil May Cry 3, Vergil realized that in the short while after the time he "invited" Dante to the tower, in order to take his amulet, Dante had matured a lot, both in power and character.
Dante came to the tower as an ignorant kid, without any goal, without any resolve. In the end he only wanted to see Vergil again. Since instead of talking they communicate through battle, the duel started the moment they met.
Back then Vergil had a plan (unbeknowest to Dante), a resolve and the power to see it through. Dante had nothing, so he lost.
In their last battle Dante knows exactly what Vergil wants, and desires to stop him. He throws questions about Vergil's purpose, to which Vergil only answers with rage. In this battle it is Dante that has a reason, a resolve and the power to see it through. Vergil realizes the more they talk that Dante is right. He doesn't want to hear it, doesn't want to accept it, so he attacks Dante instead of looking all cool and answering him as he usually does. That's why the battle was lost to him from the very beginning. And he kinda knew it deep down inside.
If instead of power he had some other well-thought plan, for which he was entirely sure and devoted, and Dante still tried to stop him, I think then yes he
might have killed Dante during battle.
But I don't see him becoming purely evil. Mad yes. Evil no. Both are incredibly dangerous, but the first is unpredictable, thus scarier. And a never-ending lust for power leads there.
By the way, I love this discussion.