The only thing the Study Group side is doing is getting more people killed and the MC's claims of 'I do know!' is complete bullshit because we literally saw he has no fucking clue what's happening.
Like what if they get their way? The 'm-m-murderer' get his throat slit in some hospital room or prison cell, the sister get a bullet to the brain and both the father and the son can continue being absolute murderous rapist monsters in impunity.