Answer is pretty obvious.
Either they do not believe it is a genocide. Or they are working to convince everyone they believe it is not.
Either way both are not reporting it as such. So avoiding such interviews would be hypocritical of them.
Its a bit like asking farrage why he dosent change his name to dickhead. Weather he believes he is one. Or just want you to think not. Nothing he's ever done would suggest its likely to make decisions based on admitting it.