Whether Zimmerman did so consciously or unconsciously, it's hard to avoid that race played a part in his decision-making, influencing his thoughts, attitudes and actions toward young, black males. There's a growing body of research documenting just how powerful implicit or unconscious biases can be.
Global society is complicit in structural discrimination, and we have all become actors in that process. Each of us has had our humanity compromised by the current power structure. On the other hand, we all regularly participate in a system that protects a select few, and we all play roles that contribute to the denigration of others.