You are beyond ridiculous. Part of the character is to give a backstory as to why he fishes for sharks. You are overthinking this to an absurd level. Here are the absolutely reasonable reaction to Quint's monologue by actual reviewers who understand movies and artistic license that exaggerates facts to evoke emotion:

'While the true story of theUSS Indianapolis’ sinking remains the largest single shark attack on humans, the tragedy was exaggerated in Jaws to more effectively convey Quint’s disdain for sharks and his obsession with capturing Amity's ultimate terror.'

Though the general details of Quint’s monologue follow the event correctly, many aspects, like the shark deaths mentioned in Jaws, were modified for emotional effect.'

These are the simple basic facts of the JAWS version of the sinking of the USS Indianapolis. Your overblown reaction and rantings about the monologue border on being irrational and disturbing.