ABC believes there are "crazies" out there who have a thing against Chaz Bono ... and network execs have taken precautions by ordering security for Chaz both on and off the "Dancing with the Stars" set. Sources connected with the show tell TMZ ... there have not been any specific threats against Chaz, but the honchos know there's an element of hatred out there and they feel it's necessary to block Chaz from harm. As a result, we're told Chaz will get security while he's on the CBS Television City lot -- where the show is filmed -- and off...