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morally evasion and avoidance are synonyms
Nope. As I and many others have stated, having an ISA, pension etc. is tax avoidance but is clearly not morally synonymous with tax evasion. You could argue that morally tax evasion is synonymous with a sophisticated, offshore tax avoidance structure depending on the individual facts. This is exactly what Cameron has argued and is now rightly getting roasted.
Consequentially, absolutely. That is, if you're happily immoral, but don't want to risk going to jail.
One could easily make an argument that morally they're the same thing. In fact, I think both Cameron and Osborne did just that.