"Drivers are without question invited to express their opinion and show emotion, passion is the very essence of any sport," Warburton said.
"It is not our intent to suppress comment but encourage it. There have been many instances of it so far this season when drivers and teams have openly expressed their views to the media.
"In this circumstance, however, the comments were found to have included direct threats towards officials, which in any sport is unacceptable."
Ingall and his team accepted the penalty, which was finalised by Confederation of Australian Motorsport (CAMS) stewards.
Ingall will write to the officials to formally apologise for his comments.
Ingall, who had superior speed to most of the field thanks to changing his tyres, had zoomed into a podium position from the back of the field.
But after being served his punishment for bumping David Wall in a passing move, Ingall lost a dozen race positions and finished 10th.
-AAP