Mark O'Mara : Michael Brown shooting raises concern about racial injustice . O'Mara says we do n't know enough about evidence to draw conclusions . Comment: O'Mara : We have to work together to make sure other tragedies do n't happen .
Mark O'Mara : Michael Brown shooting raises concern about racial injustice . O'Mara says we do n't know enough about evidence to draw conclusions . African-Americans have a justified fear of becoming victim to racial bias , he says . O'Mara : We have to work together to make sure other tragedies do n't happen .