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Even with NO compassion, loss of soldiers in a war is a legit ground to oppose a war. Even if you just coldly view soldiers as a US asset. In debating a war, loss of military assets is one of the legit factors to weigh.

But I don't think detractors of the war have feigned compassion. You think they don't mind, or are neutral, on our soldiers dying? I suppose there are some extremists like that, but I wouldn't put the majority of war detractors/critics in that category. It's a war with lots of grounds for criticism, and many reasonable people are detractors of this particular war.