Bacher led South Africa to a 4-0 whitewash over Bobby Simpson-skippered Australia in the 1969-1970 season.
"In this age of a thousand cameras, it was stupid to even think of doing it (ball tampering), and incredibly stupid to go through with it," he told the South African media.
TV cameras caught Cameron Bancroft trying to change the condition of the ball last Saturday in Cape Town using a piece of grit-encrusted sticky tape during a Test won by South Africa.
Smith later admitted he hatched the plot to cheat with the unnamed "team leadership" and is now facing disciplinary action, possibly later Tuesday.
Reports say Smith and vice-captain David Warner could be banned for 12 months and sent home in disgrace.
"You have to put the blame on the captain and I believe Cricket Australia will think long and hard about taking it further than the one-Test ban Smith has already got," said Bacher.
"I feel sorry for Cameron Bancroft because he would have been acting under instructions. If the leader of the team says you must do that, what option do you really have?
"One thing that they (Cricket Australia) have always done is act immediately on things like this.
"You look back at Shane Warne, who had a brilliant cricket brain, but never got the captaincy because of his misdemeanours.
"I would be surprised if Cricket Australia did not take this further," he said ahead of a planned media conference in Johannesburg hosted by Australian cricket boss James Sutherland.
South Africa lead the series 2-1 going into the final Test from Friday at the Wanderers stadium in Johannesburg.
ali bacherball tampering cameron bancroftDavid Warnerincredibly stupidShane Warnesouth africa vs australia 2018steve smith
First Published: March 28, 2018, 7:50 AM IST