The Netherlands are European leaders when it comes to wiretapping communications. Its laws gives the intelligence communities extensive powers to tap, filter and store. This was already the case well before 9/11. Secondly, privacy is usually not a political or social issue of any real significance.
https://www.bof.nl/2012/05/08/netherlands-first-country-in-e...
I don't see anything wrong with wiretapping with a warrant. Do people who argue against them also argue against home search warrants?
Phone wiretapping is simply one way a country can decide on by which criminal activities should be traced. Other countries do so in different ways, and comparing them, especially in different jurisdictions is not straightforward.
For civilians that do not exercise criminal activities, wiretapping will be less of an influence on their lives as ACTA or non-net-neutrality would be. On average.
The latter is particularly worrying, because we already know that in other areas, police access to private data collection is seriously being abused, and very badly organized.
The oversight basically starts and ends with granting the permission to wiretap. Everything else is murky as hell.
Come to Poland - to most invigilated country in Europe.