Although it's the Vulcans that are supposed to be more pacifist, as Surak taught peace and as we saw in "savage curtain," always favored non-violent and diplomatic means to resolve conflict. Spock would actually be closer to the "full Vulcan" position if that was his view.
Given the behavior I've seen from Vulcans across all Star Trek series, it's my impression that the people who preached Vulcan philosophy the loudest were also among the most hostile and belligerent of their race. Half-human or no, Spock's behavior seems much more in line with how Vulcans are supposed to behave than most of his peers, who go out of their way to look down their noses at him and his human peers. --Sran
Vulcans might be more pacifistic, but they are also coldly logical. If the situation logically will result in war, then that is the most likely result.
Frankly, Perrin is a rotten wife. She not only spent years covering up Sarek's illness, to the point where he nearly endangered a mission, humiliated himself & damaged his reputation, but in the end, Sarek is pining away for Spock, and the time we saw it can't have been the only time he did that. Sickness or not, it had to have been obvious for some time that he needed closure with his son, & in his state was unable to take the step. She should have gone out of her way to help her husband get that, even if it meant dealing with a son who she'd been offended by or disliked or whatever. You claim to love that man. How can you sit in the other room & listen to him mumble Spock's name & do nothing? Sure, we hardly know the whole story, but if knocking at death's door teaches those around it anything, it's that you make what needs to happen, by whatever means, before it's too late. She's human for god sake. She's uniquely capable of mending emotional breakages in ways that might be tougher for Vulcans