Should free speech supporters preorder DVDs of 'The Interview'?

Movie posters for the premiere of the film "The Interview" at The Theatre at Ace Hotel in Los Angeles, on Dec. 11, 2014. (AFP/Getty Images)

It's the only way I can think of to send a message that thuggery doesn't pay (given that many theaters are canceling their showings of the movie)—though I'm not sure how much good it would do, or even just how one can do it. Or is there a better way to help diminish thugs' incentive to similarly threaten violence (or even hacking) against movies they dislike, and the resulting disincentive to create controversial movies? Or am I misjudging all this, and on balance the terrorist threats, setting aside the hacking, are good publicity for the movie, and thus not a deterrent?

UPDATE: Sony has canceled the Christmas theatrical release of the movie, given that "the bulk of the country's ten largest theater chains" have said they wouldn't show the movie, at least over Christmas.