This explain the hatred that Barrack Jr. has for the British in a nutshell.
It also helps explain Obama's hatred of "unwanted pregnancy", like the one his own mother was "burdened" with. An unwanted pregnancy sometimes ends up with the grandparents raising the child. That child, smart enough to understand that he has been shuffled off by his own mother, and fully aware that his biological father could care less that he was ever born, might grow up thinking abortion is the greatest thing since sliced bread. Even murdering babies that survive abortion attempts would seem like a fine idea to such a bitter child.