New film 'Civil War' explores dangers of political polarization
• Director Alex Garland says his new film Civil War is about "checks and balances" and how polarization can lead to extremism
• The film centers on a journalist going to the final battle in war-torn Washington D.C.
• California and Texas join forces against a "fascistic" president who has dismantled legal systems and made himself a three-time president
• Garland says he wanted to avoid reflexive political polarization and show that stopping fascism is more important
• The film conveys its message through implication and conversation rather than overt explanation