Bad comedians

i find comedians who use race, disability and serious issues, as a joke, are extremley offensive. i understand that some people find them funny,but these are not the people who have suffered at the hands of a disability or historic disaster such as the holocaust. the more terrible the event, the more jokes seem to come out of it, such as 911. i think that comedians such as roy chubby brown, are terrible and obviously have no consience if all they can do is get their comedy inspiration from other people's suffering.