Why are cockroaches not scared of people?

Philippines
July 4, 2010 7:14am CST
I hate it when I see cockroaches. I even hate it more when they come after me like they're not even aware that I can kill them anytime. I don't even know if they have brains. hehe they're just so clueless! Well they're very dirty so we have to get rid of them to prevent the spread of germs.