I should probably have been clearer, but that was my point--the fact that "drug dealer" is too broad a concept. Even though some dealers are definitely career criminals, and some might also commit violent crimes, lumping a large majority of them in the same category as murderers is what got you (and other countries to varying degrees) into the whole mess in the first place. It is rhetoric only meant to scare people and shut down thinking.
That said, I do agree that there's a large amount of people in prison that shouldn't be there, and the US prison system ensures people stay or return to prison later on.