Majority of the common people don't see bitcoin as a scam. I am saying this from my personal experience because I have spoken to a number of people regarding bitcoin. Definitely the outlook varies from places to places, but I have seen people consider it as illegal in my country, rather than a scam. This situation is very difficult to change because of its legal status in many countries!
In majority of the countries, bitcoin doesn't have a legal status! It is either banned from government or banned from banking channel. Which certainly creates a misconception about bitcoin in the minds of the people. We all need to fight against that misconception firstly to make people understand about bitcoin.
Honestly, I haven't heard someone around me say it's a scam. I keep hearing it from forum members so I had to find a way such mindset can be changed.
Regarding bitcoin being legal, I understand this and I know this is one of the big things to be tackled but then, in some countries where Christianity isn't accepted, there are still Christians there, and they do their prayers (even tho in secret). Or, we could just focus on those who's country doesn't label it scam. Before we're done with them, the other countries must have bent down and reconsider their decision.