Ok, I'll bite.
There's nothing preventing you from liquidating your IRA, pay the appropriate taxes, and move your money offshore to another country. Lots of foreign banks would rather not deal with the hassle of opening bank accounts for US citizens due to FATCA and all the reporting requirements for "US person", but if you can find a foreign bank willing to do it, just remember to declare your foreign bank account to the IRS and pay taxes on any income earned on the said account.
Or you can move your money offshore and buy foreign real estate. There are no IRS reporting requirements for foreign real estate holdings.
There's nothing wrong with looking to diversify your assets internationally, as long as you understand all the risks, tax implications and reporting requirements. Personally, I think the US is as good as it gets, but YMMV.
I think this sums it up very well.
It works both ways for retirement accounts. People who move to the USA and want to move their equivalent of an IRA to the USA find the same issues in that it can't be done without liquidating the account, so in most cases it is simply better to leave it where it is and allow it it to grow, especially since these days it is easy to manage these things online from anywhere in the world. The US has a tax treaty with many countries and one thing that seems to be common is that they respect each other's "pension wrapper" accounts and don't tax them at all until distributions are made.
As mentioned above, US persons have to report the value of all foreign accounts including retirement accounts each year, but they are not taxed on them. (If the sum of all accounts is greater than $10k).
Vanguard UK, just like Vanguard US, has some of the lowest fees around and are very popular, but if you are a US citizen you cannot be a customer even if you live in the UK.