That’s not always true, and increasingly less so, particularly the Australians and the crime of child sex tourism. I am sure it’ll be expanded to hate crimes and disturbing the peace laws as well and from there used as a political cudgel to suppress opposition to government policies. At least for now you have to be a citizen of the country but the UK has stated an intention to extradite US citizens for online hate crimes.

In the US there is a federal law related to this: https://en.wikipedia.org/wiki/Travel_Act