I don't know if that's philosophy or psychology.
Sounds more like psychology to me, though. People do get defensive, and confabulate.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 15:02, archived)

It was philosophy
it's been confirmed by psychology. I forget what it's called, I think it was a Kahneman and Tversky bias.
( Flapjack I spay a little mare for you, Tue 16 Jun 2009, 15:07, archived)