From my experience alone and of all of the people I met over the years, one's political views is not a good tool to judge whether one is capable of being aggressive or/and violent. That is clear as day with some protests, where some individuals, despite having 'left wing' views, are quite willing to commit property damage and violence to get their message across.
As for myself, I am no stranger to violence or aggression, upon myself or committing it, but always in defense of myself and friends thus far. I mean, I play roller derby where one cannot be shy at hitting someone else, and something I am not afraid in doing in the context of the sport and to help the team, even if I risk injuring and hurting another person which unfortunately has happened. I do what I have to do, and worry about the consequences or feelings after.
Despite my political views, I have no qualms to do my duty and help maintain the safety of the team/unit, even in a war I am may not personally approve of. If I end up shooting someone(s) as part of that, so be it. I do what I have to do, and worry about the consequences and feelings after, as I am sure I will not have time to think about it in the times that matters anyways. Most I can do is hope I do not accidentally friendly fire or kill non-combatant civilians. If after the fact I happen to object, then there is the conscientious objector process and VR when the tour is done.
In the end, I brought the protest stuff to help spur discussion in this thread.