The producers could've just kept the cookie in the jar and never talk about the subject. But they did... There are way too many Americans who simply will not believe that their gov would do such a thing, so forcing those to look the truth in the face should, in a normal world, should count as a good thing. It should normally make the movie stand out from the crowd, brave enough to talk about such a traumatic reality. But it doesn't... It's not the movie's fault. In a normal world, any topic about torture should be "torture is bad, m'kay? case closed, don't do it, whatever the reasons!". But since in our world the US, the world's pillar of democracy and liberty, has spat in the face of the Geneva Convention, the torture issue has taken a turn for the worse. If some backwater 3'd world country uses torture, it's something we can all deal with mentally. It fits the bill. But since the US do it (and who knows who else, the Vatican maybe?!), suddenly torture becomes a "topic", something to be discussed, weighted, like the iPhone price. I've had my share of Youtube clashes with 'Murikans (god loving christians no less) who advocated torture, endorsed it, applauded it, while at the same time denying it happened. The fact that the movie has become controversial is that THESE people are capable of viewing torture as a good thing and this taint has fell on the movie itself.
What I loved about the movie was that it showed US torture as horrible as it is. Torture is torture, but the way the US does it just make you want to puke. I'm a gruesome person, almost an expert on medieval torture. But the modern way is much worse. I'd rather share Ravaillac's fate and be done with in 13 days than end up in Guantanamo for years and years.