Except that in the instance where the child chooses to be influenced, for better or worse, against their parents wishes, it's them simply making a decision that may or may not be a mistake. No amount of parenting is going to guard against everything they deem to be a mistake. To set the standards of success and failure there is absurdly unrealistic.
That's not being influenced, that's a conscious decision. If the wrong decision is made, then they need to know from an early age that there will be consequences.
Whether it's doing drugs, driving under the influence or sharing naked photos of themselves and others, it's something most parents have time to plan for. There's plenty of time to lay the proper foundation so that most of these things can be avoided. Sure, I concede that everyone makes mistakes and that no child is perfect, but you can teach your child to know what will and won't be tolerated.
You're not going to convince me that one young adult's behavior being different from another is based on luck. There will always be outside influences but as a parent, you need to be vigilant and recognize these things and engage with your child at all times to ensure these influences do not take hold. Basically you need to be like Agent Smith; see everything, hear everything, know everything, and anticipate everything. So essentially, put down your own iPhone, get off Facebook and YouTube for a while and devote more time to your kid. Oh and Netflix Kids or video games all weekend is not parenting, it's pacification.
Complete bullshit mate, let's be honest.
Me and my brother were raised the exact same, exact he is easily more influenced by others than I am. Fell into the wrong crowd at school, etc etc
Has more to do with personality.
You and your brother sound just like my two nephews; one is strong minded and doesn't care what anyone thinks, the other is pretty much a follower. My sister and brother-in-law swear they were raised the same but from the outside, there were subtle differences that myself, my father and mother all recognize. Also, humans aren't born with a personality.
I can practically guarantee that every parent is mad at the school and every child involved - aside from their own.
Working in childcare has taught me that 95% of parents hate taking responsibility for what their children do. No matter what age they are.
Truth, they hate it even more when they're made aware of such.