Bitcoin has not become popular enough among people that it can be used to buy all the food and clothing, etc., that you need to live. Because of this, every pro-Bitcoin person needs to look at all the issues regarding Bitcoin.
People in governments who are anti-bitcoin, are keeping part of their focus on what Bitcoin might do to the fiat currency system. Bitcoin might collapse the whole structure of money if it can't be controlled, or if the people that use Bitcoin can't be controlled. Something like this could change the wealth structure in the world. It could shift the wealth, and the governments don't like this because they would lose control.
If Bitcoin crashed the fiat currencies (which will crash on their own, anyway), and if it was done before the people are using Bitcoin for all the things they do in life, there might be a lot of pain and death until things settle down.
Think of how many people are fully dependent on government checks, and their retirement accounts in the corporate world, with no other source of income or method to obtain food.
Think of all the big inner-city dwellers who would have no way to even grow their food. The fiat currencies will crash. We need something that is better to take their place. Bitcoin could be that something. But in moving into position, Bitcoin will actually help to destroy the fiat currencies.
So you see? There might be a lot of anti-bitcoin talk among the people who depend on the dollar, the government and the banking system. It shouldn't be this way. But people have let themselves be enticed into a hole called socialism. And the thing that backs socialism as it is today is money. When the money collapses, socialism will collapse. The people who depend on socialism don't like Bitcoin, because it is helping to promote the collapse.
People don't understand that the BIGGEST area of crime is the crime done by the banks and the governments. But even if they did, they have grown dependent on the banks and government so that they cannot live without them. This is part of the reason for talk against Bitcoin.