Tax Avoidance___Morally repugnant?

What is morally repugnant is a government that sets-up tax-avoidance schemes and then moans like fuck when people have the temerity to use them. A previous government removed the Inland revenue's duty to only collect that tax which was due; instead it switched the burden onto the tax-payer. It would therefore seem that it is every citizen's legal duty to avoid tax.