What is the reason why libertarian and other economic freedom parties have not much support in European Union countries?
These are a few of the many political fronts in Europe:
- Conservative Christians
What you describe as "libertarianism" would fall under the "liberal" label in Europe. It's heavily equated with liberal economics and the financial community.
It's actually quite popular in Europe, particularly among the youth, and it's probably what the center-right/conservatives are morphing into... economically liberal, socially liberal, but conservative on immigration and multiculturalism.