My take:
Trump's move to force drug companies to keep prices at certain levels is technically against what the Right believe in. It doesn't matter whether the end result is good for the people or not, the fact stands that he is doing what he (probably) says he's against. Then again, this doesn't surprise me, because very few politicians do or say anything out of genuine belief/conviction. Trump is doing this to make himself more popular with people, that's all. He goes against what the Right/Republicans believe in, because he does not have any political convictions whatsoever. Behind closed doors, and in his heart of hearts, he doesn't give a shit about whether this is price control, whether price control is socialism, whether socialism is good, whether it's morally justifiable to force private companies to charge certain prices for their proprietary products....etc. He doesn't care about any of that stuff. He did this purely to win people's hearts and then later on, maybe their votes. Trust me, he doesn't give a shit.