What I find interesting is that these leftists really haven't comprehended that in the case of WWIII neither they nor their family members will be protected from the resulting harm their insane policies have caused. Just because the U.S. emerged in one piece and prosperous after the first two world wars doesn't mean that we'd necessarily get through the next one relatively unscathed aside from the deaths of millions of our military personnel.
The practical point of studying history is to LEARN from it.