If they really aren't interested, it's a pretty straightforward process to walk into the nearest embassy and opt-out: http://travel.state.gov/content/travel/en/legal-consideratio...
It's expensive to renounce US citizenship.
You mean if they've been living and working for years in the US, and taking advantage of US tax-advantaged retirement accounts?
Now we're talking about a different person than the parent commenter: "(loosely defined as people who were born in the US decades ago) who do not live or work in the US "
> * Your average annual net income tax for the 5 years ending before the date of expatriation or termination of residency is more than a specified amount that is adjusted for inflation ($147,000 for 2011, $151,000 for 2012, $155,000 for 2013 and $157,000 for 2014).
> * Your net worth is $2 million or more on the date of your expatriation or termination of residency.
> * You fail to certify on Form 8854 that you have complied with all U.S. federal tax obligations for the 5 years preceding the date of your expatriation or termination of residency.
This applies to a tiny subset of people who are either a) Extremely wealthy, or b) Already tax deadbeats.
"If they get into legal trouble abroad, they may enjoy consular protection from the US State Dept". FTFY.
Now let's play devil's advocate and see how you could benefit from those taxes even if you are away? -- Well you could return and then start taking advantage of services, goods, infrastructure, security, protection etc. Something could happen to you and you could request assistance or evacuation. You can use your passport to travel to many countries without a visa. You could vote. But yeah that's all I can think of. Not very convincing. Certainly does not seem worth it.
The main problem they are trying to solve I imagine is people who become rich, and then all of the sudden scurry to a private islands and stop paying taxes.
Basically, this guy: http://www.foxnews.com/tech/2012/05/11/facebook-co-founder-r...
That said, I don't think US tax policy makes much sense. I know of no other country that tries to tax the foreign income of citizens living in foreign countries.
http://www.cra-arc.gc.ca/tx/tchncl/ncmtx/fls/s5/f1/s5-f1-c1-...