Comment Re:Dangerous precedent (Score 2) 175
The US, UK and now many other common law countries actually do claim universal jurisdiction for a few select laws, most notably extraterritorial child sex tourism laws. You can murder someone in another country and you have to be prosecuted there, you can't be extradited home to be tried somewhere you didn't commit the crime. But so much as touch a child's genitals and you can be tried there *or* extradited home to face a court under extraterritorial laws, whatever the officials feel like doing on both sides.
Another example of U.S. extraterritorial laws deals with Cuban cigars. If you're an american, you can't smoke a Cuban, even in another country. The penalties for an individual -- you can get fined up to $250k and spend 10 years in prison.