Most of America's recent wars have been unjustified.

I think it's very reasonable to not want your products or work going towards making it easier for the US military wage unjustified wars.

I also think it would be reasonable to change your stance on that if America entered a war that you felt was justified.

(For example, I don't want to work for the military, but if we were being invaded I would consider it.)

Saying the military can't use your tool _today_ doesn't prevent you from changing your mind _tomorrow._