Sutherland got killed due to really bad luck. His political beliefs had nothing to do with his death.
Spires, who had attended a private college in North Carolina but was no longer enrolled, was previously arrested most recently on Thursday when police said he accosted a man on Wisconsin Avenue in Friendship Heights and later kicked two officers as they tried to handcuff him. Police had forwarded to prosecutors charges that included felony robbery, but because nothing was taken from the man, the U.S. attorney’s office said there was insufficient evidence to support the charge. Prosecutors instead charged Spires with misdemeanor assault, and he was freed from custody Friday.
If you want to blame anybody, blame the law for not keeping this criminal behind bars. Spires had already committed a crime and was clearly a danger to others but since there wasn't enough evidence for a charge, he was let go. Had Spires been charged and kept in jail, then the poor soul that got killed would still be alive today.