I suspect that its a problem about policy and culture ie people hate paying taxes and governments tend to appease them to avoid risking losing votes. I am Southern European same as
@barros is and we both assure you that tax evasion is a problem in most South Europe.
Back in the 90s Malta was lead by its best Prime minister ever. The man modernized the country, the economy was doing very well, there were near zilc unemployment rate and people absolutely loved him. This man is a frigging icon both main parties adore (a bit like Churchill).
His competition at the day was a bit like Corbyn, a person people just love to hate. There was absolutely zero chance of eddie losing the next general elections. Unfortunately for the old fox introduced VAT and voila he lost the next general election. Competition won the election purely by saying that once in government it would abolish VAT. Unfortunately for us the man was as competent as Corbyn was and fortunately for us it took only 2 years before his government went tits up and good old Eddie Fenech Adami returned to power. That gives you an idea of how people down South hate taxes especially indirect taxes such as VAT.