I doubt that the tax is the problem. I think people dont want to invest in Bitcoin because they do not understand what it is and how it works.
Then I think they are the most stupid persons on the earth. If they dont know about something, definitely they will not be investing in bitcoins. They must understand the importance and prosperity of bitcoins. They must know how better bitcoins would be giving out the profits to users in short and long term. When they become convinced, they must be learning the how and what of bitcoins.