the whole DmC comformity/nonconformity amuses me greatly the game on the outside gives out the message of conformity however things are treated as good v evil which is silly because if it was give a non-conformist message we would get something from mundus to justify his rule other things apart from his humans are weak mini speech that can be argued as invalid since he had such poor reasoning and examples then there is dante himself he started as archetypal young adult DBAG then at the end he became the hero and was all like "i am humanitys protecter no this not cliche no i am not having a identity crisis portrayed in a cliche and thus conformist way" really i could go on about how after you scratch the surface the crystal loses it's radiance and eventually becomes just another rock (actually that's a pretty good metaphor ITS MINE NOW)
I agree with you on this part, but with some more considerations to be made.
In general, you are perfectly right in saying that, although DmC wants to deliver a message like "Think with your own head", on the other hand, in practice, it gives you a fixed message about those complex issues: "Dante is right".
The style of the narration makes it evident whose side the creators are taking, Dante's, and conveys the message that Vergil is no better than Mundus. This is a fixed message, with no room to debate: Vergil position is demonized, since he is not given enough space to explain his reasons (and he may have plenty of them).
This emphasis on the positive role of Dante, moreover, suggests us to read Phineas' question "Once Mundus falls, who is going to take his place?" in a specific direction: we are prompted to think that he is warning Dante that once Mundus is defeated, someone else would take his place, AND THAT THIS WOULD BE BAD (thus Dante has to stop Vergil etc etc). This last part is
not explicitly declared, so why do we all interpret it in this way?
I think this is because Phineas is presented by NT as the moral guide, the one who says what is Right. And since it is clearly suggested by the narrative that what Dante does is in the end right, we
have to read Phineas' line as praising what Dante does.
But what if the narrative was not so explicitly in favor of Dante's decision? What if Vergil was given more space to defend his position, in a way that doesn't demonize him (note that this demonization, the fact that his statements in defense of his positions are posed in a way that is clearly to be read as the most negative possible, of Vergil is
necessary to show that Dante is right)? What if he explained his reasons in a way that makes you think that he and Dante may both be right?
In such a case, I think, Phineas's words could be read differently, could be read as such: "After Mundus is defeated, beware that humans may need help, may need a guide in rebuiliding their society, may need someone to defend them from other perils (another demon king, for example). Who is gonna take on this necessary role?"
(A similar discussion, moreover, can be undertaken, as you suggested, about Lilith's murder, and also about Kat's rescue. The "You would risk the future of mankind for a girl" line is not one to be taken lightly. It can rgive birth to a very complex discussion about the necessity, in politics, to face certain sacrifices. Important thinkers like Max Weber and Machiavelli, whose thought should not, again, be demonized or simplified and easily dismissed, say that a political leader has to face such sacrifices, and accept that he will have to come to compromises that are not as morally pure as we would like them to be.)
In the end, we would have to decide for ourselves which side we want to take: we would have to
think with our own head, which is exactly the message that DmC tried to convey from the very beginning.
However, although I would have really liked such a take on the story, on the other hand we must consider that maybe raising complex issues such as those is not the primary purpose of a Devil May Cry game, since the franchise is gameplay oriented and asks for a quite linear storyline.