That's the incredible value of the 'free marketplace of ideas'. It let's us take them for a test drive, see what works and what doesn't, tinker with them a bit and then either drive them home - or test out a newer model. Some, like the need for freedom and justice, we keep under the hood all the time. Others, like ducking under the covers every time other nation-states say boo, we have mostly discarded - well, we still keep our isolationist blanket in the closet in case of emergency.