Athletes of the 80's are nothing compared to the athletes of today. Jacks may have been the best in his day, today he wouldn't even make the olympics or a world championship.
And you're wrong about judoka's bench pressing. Firstly, they bench press because it's important to have a balance between your pushing muscles (bench press etc.) and your pulling muscles (rows etc.) to prevent injury and core imbalances. Secondly, a larger, stronger muscle also exhibits greater isometric strength, and actually if you watch a typical Judo fight, there is much isotonic movement as isometric.
Do you think Teddy Riner got to be 140kg by holding some weights in static positions all day?
And why do you think bench pressing is very bad for your muscles? You can believe pretty much anything you like, (God, Toothy Fairy, Santa Claus) but it doesn't mean you're right, and I'd be interested to know what evidence you have that bench pressing is bad for one's muscles.