How does Fredo care about his family when he witheld vital information from Michael about the senate hearings? Michael is not a psychopath, the people around him was inflicting his dark emotions. Think about it,

Connie: Doesn't respect Michael for killing her psycho husband who kills her brother (Sonny)

Fredo: Almost kills the whole family and witheld information to back Michael up

Kay: Aborts the baby

So who is truly loyal to Michael? Tom?..that's about it.