I guess my objection is with the idea that Obama OWED the UK allegiance at birth.
He was eligible to claim citizenship in the UK, but foreign law does not obligate him to do so, or divide his natural loyalty.
Given that:
1) His father never seems to have lived with his mother, and he was raised by his mother or her parents, and
2) his father completely abandoned him at a very early age, and
3) his father wasn’t legally married to his mother, since he was already married at the time and bigamy was illegal,
4) he has never in any way acted as though he had allegiance to the UK, and
5) he has deliberately snubbed the British government on multiple occasions,
I find the idea that Obama owed natural allegiance to the UK ridiculous.
Also, the USA does NOT support the ‘once British, always British’ doctrine - we had a war over that in 1812...
He was granted British citizenship at birth and did not have to take affirmative action to claim it or retain it at the age of majority, just like his U.S. citizenship.
(Stipulation: Some dispute Obama’s being granted British citizenship at birth based on his being an illegitimate child of an unrecognized marriage under the BNA of 1948.)
When Obama was granted his Kenyan citizenship upon Kenya’s independence from GB, he was required to take affirmative action to retain that citizenship when he reached the age of majority. (I believe that’s correct. Someone please correct me if I’m wrong.)