We can't change what most people think, but we can't also think the same way they do. We can help others by giving them the right information and changing their mindset towards how bitcoin operates and why it should not be regarded as a scam. 
 
Most people view and picture Bitcoin the way they picture it as a scam because of how they got involved with it. Most of them were introduced to Bitcoin through some scammer, which used that means to scam them. Some know about Bitcoin through some scam Ponzi scheme, so their mindset towards it is just based on those experiences, so we need to educate as much as we can on what bitcoin truly is.