Sure, but did you ever think Vergil could have choose to follow the path of demon's heritage because something had happened to him? Something more than " my mother is dead" excuse? Nero is more human than Dante, Nero is visited by Vergil in his dreams, who tries to convince the boy to hear " the cry of the soul" inside him. Nero describes the guy's glare as cold, but, at same, gentle. That's right, Vergil feels gentleness/tenderness towards the boy. This is written in DMC4 novel.
Vergil knew the boy and had feelings towards him. This boy wasn't illegitimate at all.In these new trailers Vergil has something or someone in his arms and probably is a baby, his baby.
Trinity of Fates( an official DMC book made by Capcom) says clearly Vergil has no bad feelings, no hostility, no hate towards humanity.He is a son of Sparda, he can't have such feelings. You can find that part of the book in this forum if you don't believe on me.