My two cents worth!
Maybe so However from what was seen onscreen

I reckon Vito pursued his best available options to secure a relatively good life as he saw for his children not what was best for them

Sonny
Family man Vito, criticized him only when his "comedy" with Lucy Mancini affected business

Fredo
It was Sonny, placing him under the protection of the Molinaro Family and sending him off to learn the casino business

Don't know Woltz He's quite a cold and cunning character, actually in GFII

Michael
He could have walked away, handing over the future of the Corleone organization to Clemenza and Tessio instead of dragging him in, to settle all Family business and then try to pursue his “legitimate” future life as if

only guidance seen was coaching him about the Baptism massacre and leaving him with a murderous legacy

Carlo
He let his daughter marry him, then treated him as an outcast and the family man father did nothing about her domestic violence because of which her brother was forced to get involved, resulting in Sonny's murder