Spot on - this isn't an alternative christmas message, if it was they would have chosen someone without the access to the national media or the powerful, someone fighting against oppression, not one of the oppressors. Choosing Ahmedinajad puts it on exactly the same footing as the official one.
It's not like there's a lack of other options too - if they insisted on doing something to with the area they could have chosen someone like Maryam Namzie or another of the many political activists chased out of Iran by the Theocracy under penalty of death and they'd have got some who'd make the argument against both US intervention and the Theocracy. If they wanted to pick some simply to piss off the US (which is the sniggering schoolboy approach i think led to Ahmedinajad being chosen) Moazzam Begg. They could've got someone from human rights watch, medicenes sans frontieres and so on.
Instead they chose the holocaust questioning head of a theocracy that kills people for being gay, locks people up for setting up trade unions or political parties and so on - all so that a group of aging tv execs at a channel whose broadcast content consists almost exclusively of reality tv, property shows, crap teenage soaps with wannabe stars and american trash can pretend to themselves they still run a radical channel. Fucking pathetic.