Well put Evita Another Excellent movie-fact based analysis

Sure thing Lou “Tom, you're my brother, the only one I completely trust”!

Michael like father like son same as Vito, the enemies have to be wiped out

Vito was brutal indeed Murder, extortion, cold blooded violence, threat of lethal violence even in such simple business matter as the Bandleader's signature or brains for his Godson's contract release - comply with his “justice” or die
and killing machine Luca, Vito's most valued friend

Also Michael could not provide fellow immigrants with favours and protection like Vito - always with a caveat "Some day and that day may never come, I'll call upon you to do a service for me" - as Michael was a “legitimate” businessman

Exactly Evita Fredo was complicit in trying to get his brother killed for personal gain arguably the Donship, Fredo so coveted, Don Fredo Corleone and would have been just as horrific and guilty of fratricide if Michael had been killed The intent was there