1997 Honda Civic LX

After getting an alignment (I was suspicious that something got messed up) I came to find out I have negative caster on my front right (passenger) suspension. The front left is within spec at +1 degrees, but the front right is way out at -2 degrees. After looking for a bent control arm, I found nothing. Is it just a fucked up ball joint? What am I missing here?

 

If not a bent control arm, then the subframe that the LCAs bolt to could have been moved.

Any ball joint that "fucked up" would probably have obvious play and be completely noticeable without an alignment. The same should apply to any bushing destroyed enough to let the alignment move that far out of spec.