Poorly refined Carbohydrates are the real problem.
High refined, I think you mean. Anything that causes insulin spikes I suspect.. I hesitate to separate one substance and demonize it (like HFCS), because then we stop paying attention to the others that might be doing harm as well. So I think its all the cheap and easy carbs we are eating that is the carbs.
For the vast majority of human history, carbs used to have a large cost. They were difficult to digest, and or difficult to come by (fruits). Now, they are cheap and easy, both digestively and economically.