You beat me to it. The fact that national defense is (a) Constitutionally mandated and (b) wholly in keeping with conservative principles is something leftists just can’t grasp. It almost like they collectively suffer from some type of mental illness...
Whenever you hear leftists talk about issues, notice how they always conflate legitimate issues with their illegitimate ones to try to get you to accept them?
“Oh, you don’t like welfare, huh? I suppose you’re against roads, police and fire protection too!”