Why did bassist Peter Gifford ('Giffo') quit Midnight Oil?

PETER GIFFORD- SHoF 2022 1970's ERA TWO INDUCTEE

PETE GIFFORD No Time At All (12/15) 1976

Midnight Oil - Knife's Edge (Live, 1982)

Sgt. Peter Gifford, Salem Police Dept. Bagpipes

Greenslopes Private Hospital - I can’t lift my leg after knee replacement surgery? Dr Peter Gifford

MY TOP 3 MIDNIGHT OIL INTROS - STAND IN LINE - REDNECK WONDERLAND - KOSCIUSKO