Well he could have done it right away. But nooo.. he had to fap to it for a few seconds and than shootThe point of contention has been about a "pregnant woman" being shot in the womb and then the head. It's pejoratively known as the "abortion scene" - so yeah, it's about the child. Vergil's involvement isn't as important to the whole thing as what happened in it. The complaints regarding Vergil is that he used a gun, which only served a purpose for him, in the same way it did when he used Ebony in DMC3.