Because they choose to interpret a religion to meet their own ends, in the same way that some portions of the South African Christian church used the bible to justify apartheid. No faith has a strict set of rules and they are open to interpretation to justify any person or groups own agenda.
Have never watched CNN - is that the general standard of presenter/questioner? I know that they are just asking questions that the producer is telling them to ask, but to sit there with shocked looks on their faces having heard his answers is a tad worrying. Good clip though.