The USA is currently an excellent example how parliamentary democracy fails and may lead to a worse dictatorship than the traditional ones.

Senate Bill 1959 to Criminalize Thoughts, Blogs, Books and Free Speech Across America
http://www.americanchronicle.com/articles/viewArticle.asp?articleID=44245


When you in the US are not able to remove democracy and freedom enemies from the government and keep them outside in future the rests of freedom and democracy you have will be finished soon and not only dictatorship but also despotism will arise.