... As hot headed as Sonny was, he would have never planned out and ordered the death of his own brother. He had a heart. Somewhere along the line Michael lost his...
Not that it would've happened the same way, but had Fredo done to Sonny what he eventually did to Michael...Sonny would've beat the crap out of Fredo and THEN ordered his death, even if he didn't pull the trigger himself. And he probably would NOT have had the patience to wait until their mother was no longer alive.
Cold & calculating has he had become, Michael had a reasonable amount of heart...even
after Fredo broke it.
Apple