Sirius
No, we didn't. They had other choices, and they chose not to take them. Or they chose to take them later, or their initial choices took them down roads where they had a whole new set of choices. Like Regulus disappearing for six years and never once letting you know he was alive.
Sirius, we can't take responsibility for the world. The only thing we can take responsibility for are the choices and actions we make now. We've learned from the mistakes we made, and neither of us are the arseholes we were at school, and I can only hope that I'm passing on my better traits to Harry and Noah, rather than the toe-rag traits, raising them to be better men than we are.