content: The shooter was on something else. Way too much testosterone flowing and he was being inconsiderate to everyone in his environment (telling the clerk what he is going to get rather than getting the item then standing in line to pay like a civilized person). This escalated because he was looking for trouble. He proved that he's an ignorant fuck head that grew up fatherless, motherless, and with a grandmother that's tired of raising children so he has no manners or understanding of how to behave in society. He's continuing on with the legacy that his bloodline is incapable of anything other than chimping out. Eventually his kind will kill themselves off in the name of street cred.