Some people have been against bitcoin from the beginning, they have been writing articles and saying all sorts of negative things against bitcoin, but we don't need to pay to much attention to these people, as bitcoin is unstoppable.
Well, it is fact that there are people who just spread FUDs on the internet to scare people from investing on it, some even say that it is a scam people had been using for a while now to fool people and get or take their money from them. If btc can damage the economy, then there would be a lot of countries that will not accept bitcoin or ban them but still, there are a lot of them accepting btc.