The former "liberal" who becomes an outspoken right-winger has become an American political archetype. Ronald Reagan and David Horowiz are two prime examples of the breed.

They use the rhetorical tool of claiming to be just as caring and compassionate as their previous political incarnation, but the left's irrationality and hatred of (you pick it) the West, America, Christianity, capitalism, etc. caused them to wake up one morning and see the light. And having transformed from lefty caterpillar into a right-leaning butterfly, they present themselves as qualified to comment on liberalism's moral and intellectual failures.

[... A] related version of this turncoat persona [...]: a "reformed" Muslim woman who favors crushing Islam under the boot of Western militarism. Once very devout in her Muslim beliefs, Ali [...] has transformed into an outspoken critic who bases her calls for the destruction of Islam on feminist and human rights principles.
[L.c.]