The bodies of three crew - skipper Stephen Humphreys, 33, from Greenock, Eric Blackley, 57, from Gourock, and Robert Cameron, 65, from Houston - were later recovered.
Another crewman, Brian Aitchison, 37, from Coldingham, was rescued from the water after he managed to escape from the tug's wheelhouse.
Speaking at a news conference in Glasgow, Mrs Cameron said she was in a state of "disbelief" after learning that the Flying Phantom had ran aground in fog in 2000.
"Recommendations made at that time haven't been enforced," she said.
"Some action has been taken, but not enough to ensure that similar accidents don't happen again and other families don't have to suffer the devastation which we've suffered."
The families' lawyer, Frank McGuire of Thomson's Solicitors, said a public inquiry was needed to explain why recommendations from other incidents had not been put in place.
"The report says that understanding the likelihood of fog occurring and having a reliable system in place that detects fog as early as possible are important aspects of managing the safety of a commercial port.
"In 2004, Southampton Port installed a fog detection system.
"You have to ask the question, why is it that a fog detection system was not installed on the Clyde?"
Mr McGuire said a fog detection system could have been installed for about £30,000.
Helen Humphrey and Linda Cameron remember their husbands
He said Clydeport's assertion that this was "not practicable" was down to financial considerations.
It is now likely that the bereaved families will proceed with civil action for financial losses suffered as a result of the accident.
Mr McGuire also said that it would be up to the lord advocate to decide if there had been any "criminal behaviour" in relation to alleged health and safety breaches.
He said that if this was found to be the case, the families would press the procurator fiscal to pursue corporate manslaughter charges.
The Scottish secretary of the union, Unite, John Quigley, said the report into the sinking of the Flying Phantom had UK-wide ramifications.
"As a result of this damning report, Unite is calling for a public inquiry and for the Lord Advocate to bring charges of culpable homicide against Clydeport," he said.
"Our members go to work to provide for themselves and their families - not to suffer injury or death.
"Unite will not let this issue slip and we shall be urging action on this report from ministers at the Scottish and UK Parliaments."
A Clydeport spokesman said: "We are studying the report carefully but feel it inappropriate to comment while other investigations continue."
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