We brought it on ourselves. In high trust homogeneous societies, not too much taxes were wasted at first.

I think tax pressure levels were unrelated to the introduction of the euro.

Edit: Except for maybe Greece (and Spain?) who were completely unsustainable with early pensions and a lot of tax-evasion. But that's an outsiders perspective.

Wow, they are really taxed over there. 
And not complaining?
Was it like this before the euro?



Satosora

This seems like a good overview:
https://worldpopulationreview.com/country-rankings/highest-taxed-countries