Peaceful and violent, in video game screenshots and movie clips and on professional playing fields, the icons come fast and furious in quick-cut footage — some of the most renowned slivers of 21st-century American popular culture, harnessed by the Trump administration to promote the freshly launched war with Iran. The White House's social media feed has issued a series of pumped-up videos that mix real Iran war explosions with movie action heroes, gaming footage and bone-crunching football a...