And most "tax avoidance strategies" (this one included) take advantage of the lack of one world government, and therefore lack of one global legal framework for

And most "tax avoidance strategies" (this one included) take advantage of the lack of one world government, and therefore lack of one global legal framework for "fairness" in taxation. So countries compete for business by offering different tax incentives, and companies move to find a balance between retaining as much money as they can and as much of the other things they need (like competent employees, which come from specific countries) as they can. The problem isn't that these strategies are unfair; the problem is that authorities can't agree on a uniform concept of "fair" because it's in their best interest to get the most business in their territory. Prisoner's Dilemma again, in the opposite direction.