Ah, but the interesting thing about Fredo's indignities is that they are self-imposed. He is weak and ineffectual, but instead of looking inward at his own faults, he decides to let the anger and resentment build up against his brother. Seemingly, his anger is directed at Vito (It's the way Pop wanted it, But it's not the way I wanted it), but as Vito's child, he is unable to express his anger at his beloved father. He therefore takes it out on the man who took over that paternal role in his life, just as Connie is. Interesting that they were both angry at Michael for ACTING like their father when he wasn't, yet they both were unable to live without depending on him.