The Glasgow bin lorry crash driver was asked to imagine his own daughter had been killed as he came under pressure to answer questions at an inquiry.
Harry Clarke, 58, has refused repeatedly to answer questions on his medical history at the inquiry into the December 22 tragedy, when he blacked out at the wheel and his truck hit and killed six pedestrians.
During a second day of evidence, the council worker was asked "do you not have the decency to think of someone other than yourself?"
Dorothy Bain QC, acting for relatives of crash victim Jacqueline Morton, said: "If your daughter was killed and there was a public inquiry trying to find out what might have prevented her death, what would you hope those who might have some information about it would do at that public inquiry?"
Mr Clarke said: "I don't wish to answer that question."
Ms Bain said: "Do you really not wish to answer? Do you not have the decency to think of someone other than yourself on this occasion?
"If you've not done anything wrong, why not help today? If you have done something ... do you not think you should begin to make amends for that by choosing to answer?"
Mr Clarke said he did not want to respond and did not comment when Ms Bain went on to describe his "dreadful" work absence record and accused him of deliberately misleading doctors to keep his job as a driver.
She said: "You should never have been behind the wheel of an HGV and you know that."