I've been arguing this point since I was in my teens in the 60's and said to a peacenik hippie: "If you came across a thug in an alley and he had a weapon and you had a weapon, would you actually lay yours down first hoping he would do the same?" The dipshit said, "Yes, peace brother."
From that day on I knew there are some people who just don't deserve to live and I'm ok if they just die yesterday (we all do). Even with their best of intentions, their rhetoric and behavior embolden the bad guys against the rest of us who would defend our lives, our family, our friends and our Country.
Liberals, socialists, Marxists, and communists are a bain on civilization as we have seen and still seeing. Imperialists were just as bad, but those days are long past except for parts of Africa. Now it's not so much about conquering, but about ideology and who gets what (not too far from the communes of the 60's). There are countless books with millions of pages that have said what I just expressed above. But then I'm not a scholar, but I have stayed at a Holiday Inn.
Amen, Brother (or Sister). :)