While Vision’s reaction to the conflict of Captain America: Civil War is entirely logical, the response from Scarlet Witch is entirely emotional.
The following contains some spoilers for Captain America: Civil War.
Paul Bettany was recently speaking with Entertainment Weekly when he explained that Vision’s decision making process in Captain America: Civil War was based entirely around logic, and as such, it didn’t leave room for his personal feelings regarding other members of the team.
According to the actor that portrays him, in order for Vision to truly reach his potential the character must begin to understand human emotional concepts like love and loyalty, something he only begins to get a grasp on during Captain America: Civil War.