"I hope we would do everything we could to prevent having a communist dictatorship on our southern border."
Even if we risk WMD attacks on our cites?
9-11 amply demonstrated that US cities already are at risk from WMDs. WMDs are more than nukes or flying bombs. Smallpox, anthrax, ebola, rare strains of influenza will kill you graveyard dead and can be carried into the U S without detection. Would you tolerate such a threat on the border?