At the same time, of course, tax havens should be nuked.
Some people claim that the UK has been and still is a tax haven itself. Frankly, I lack the in-depth knowledge about this issue to be truly able to judge this claim and I've seen contradictory points of view on the question whether the UK as a whole (and not only some of its oversea territories) can be considered a tax haven.
But if you agree with this assessment, where would you move if your country (and I assume you live in the UK) were nuked?