The U.S. does not have a legitimate claim against O'Dwyer.
It is not as if he went to the U.S., murdered someone while he was there and then returned back to the U.K. In a situation like that, extradition would be justified.
In this case, a student sets up and operates website in the U.K., where he lives. He is not an American citizen, has not been to the U.S. Therefore American laws don't apply. British law and only British law should apply.
On what basis does the U.S.gov think it should be able to enforce its laws on U.K. citizens living in the U.K? Surely, if O'Dwyer broke the law, he should be prosecuted in Britain, by a British court according to BRITISH law.
It is disgusting that this government is happy to ship British citizens to foreign countries that have no legitimate claim against the individual, and that individual has never set foot in that country.