There are a few possible explanations:
- Goodling is incompetent and consequently doesn't understand either the 5th or what constitutes criminal conduct (not likely).
- Goodling knows that crimes have been committed. Not legal but slimy ethical violations which don't afford protection under the 5th amendment but actual crimes.
- Goodling knows no crime has been committed and is invoking the 5th amendment under false pretenses.
Any way you slice it something is foul in Alberto Gonzales' Department of Justice.