The Greens’ economic policies will do far more damage than Labor’s discredited mining super tax to the investments of Australians in the stockmarket, managed funds and superannuation.What’s puzzling in this federal election campaign is why so many mainstream Australians are prepared to vote Green. Typical Green voters are often 30-somethings, have no kids, are inner-metropolitan city-dwellers and have lots of investments. They don’t like Tony Abbott because he led the Coalition in voting down th…