School Shootings Vs. Ebola: Who's Hitting Harder?

How, exactly, did Ebola become a political cause? How did it become politicized at all? I haven't the foggiest notion, but even in my disconnected-from-Facebook state I'm being constantly made aware of left-leaning people downplaying the danger of the Ebola virus, usually with a smug statement to the effect that only "ignorant" people --- meaning white people who didn't vote for Mr. Obama simply because he has an African father --- are concerned about it.