not doing anything is much easier. doing something requires work. work for some people i probably wont like anyway.
on the other hand, if i do push him, i would of been the reason he is dead. and i probably wont like him too. see a dilemma.
to let 5 people i don't like die, or to kill 1 i don't like. its not that easy to choose! Damaged had a good solution, to kill all 6. But how are you gonna get the fat guy to those guys before the trolley arrives? He is fat and heavy.
I'd just leave it as it is. Its better this way. Maybe the fat guy will get some ptsd anyway.