I don't know of any more scientific proof that socialism is a failed ideology. In the past 30 years, Communist Russia collapsed, China embraced immoral cronyism instead of communism, socialist Europe is now on the brink of disaster, socialism in the US has resulted in the downgrade of our credit rating, and people are actively fleeing high-tax and high-lunacy states such as CA and NY. By ANY scientific standards, this serves as empirical proof that socialism and liberalism are failures. By psychologists' standards, it's clearly a sign ofa serious mental defect/disorder.