That only works if you're of the belief that the current legal situation has no effect on the current legal outcomes.
The point is that cutting taxes because some people evade them anyway, does not solve anything.
The whole problem exists because the Greek state has no money. So, explain to me how cutting taxes solves the money problem if you're getting even less money?
When the stars threw down their spears
And watered heaven with their tears:
Did he smile his work to see?
Did he who made the lamb make thee?