Why Should Neo-Nazis Be Held Responsible?

After all, they weren't even born when Adolph Hitler gassed all those Jews. For that matter, why should Barack Obama be held accountable for his associations?

Obama Turned Eight In August 1969, The Days Of Rage Occurred In October 1969. Barack Obama was born on August 4, 1961. He turned eight on August 4, 1969. The Days of Rage, in which William Ayers participated, occurred in October 1969. [Obama Birth Certificate, UPI, 10/21/81]