Only idiots believe it will be a civil war.
Nope, it will be much terrible.
Can you imagine billions of peoples who know they're gonna die within few time.
And their friends, relatives, family members, collegues.
It will be a chaos, a broken society, where murderous mob will hunt remained members of in the scam involved political parties, tabloids, police departments etc.
It will be more terrible as in the 'Walking Dead' because peoples will have nothing to lose and all states get broken
You will be lucky if you don't be swallowed by cannibals or murdered by rivaled gangs