What you are blaming them for is not prohibiting tax avoidance, but for not anticipating that loopholes would be found in existing regulation. It's very likely

What you are blaming them for is not prohibiting tax avoidance, but for not anticipating that loopholes would be found in existing regulation. It's very likely that if these loopholes were eliminated, some other loophole would be found. At some point, maybe the discussion should be about the spirit of the law, not the letter of it (which can probably be worked around if you can pay for an army of lawyers and accountants in multiple countries)