Do you even understand the simple truth, that most of the times no law is broken in tax optimalizations? Only when it does, it gets highly publitized. Usually, tax systems are full of loopholes and accountants just need to be creative enough (and yes, they are...). Without breaking any specific law, by logic "what is not explicitly forbidden is allowed".
Personally, I do believe in minimal and fair taxation. If you have system where successful people have over 50% tax burden (quite common in progressive tax systems), you can expect many attempts to get away from it. Just human nature. Your textbook phrases won't help much, do they.
Just look at Switzerland itself - most democratic country in the world, one of the richest (and their wealth ain't based on banking secrecy - whole banking industry brings roughly 12% into GDP... tourism and high quality exports are primes here). Low personal and corporate taxation, and the country and system just works. Why cannot rest of europe work this way? How much tax evasion is within Switzerand? Almost none...