The wrong impression people are giving against bitcoin. Most of those people includes the government and people who give doubts to bitcoin. Government is a powerful sector that can give wrong image to people that may cause fud.
Just because the nature of bitcoin is decentralized and volatile, they're using it to bring negative impression on bitcoin. It's always the people who can give vulnerability towards bitcoin, because they're using its nature to attack bitcoin, where in the very first place bitcoin also have its cons.