It’s the imagery that has raised him to Sainthood status, for which he is not deserving of, that needs to be closely scrutinized. I think his entire record needs to be revisited to see him for the man that he was, someone seeking celebrity status and the limelight, someone who put all of that ahead of family. In his zeal to seek martyrdom, he inflicted profound damage upon his own children, none of whom have apparently been able to recover from (none of his adult children have even been able to have families of their own, a very sad spectacle). I think it is even wrong to have a national holiday named for him, especially when we ignore untold numbers of people that made very real contributions themselves, without the hypocrisy and destructiveness of this individual.
The imagery is what it is. Even if you could muster the resources to counter the layer upon layer of positive press and propaganda in the end it would only serve to make you and your fellow conservatives look mean spirited and racially biased. My course of action is to ride the horse we have been given and link MLK's dream to the principles of Republicanism and show the dangers of majority rule and of trusting the Democrats who promote it.