I think it is only dangerous to people that don't have an understanding about how it work, there are lot of people that are actually making a lot of money from trading on Forex and I think most of these things are dangerous when we do not understand it.Most people see the volatility of forestry as an advantage and other people see it as a disadvantage, I also have likely said and your comment it is very dangerous to invest in forex trade because it's all about prediction it is high volatility.