I'm a teacher: I don't need to be told that. The inhibitors on their behaviour (wisdom, consideration, fear, conscience) are undeveloped. And wishing that not to be the case, and many attempts to move that situation forward, will not be successful. I have known parents absolutely at the end of their tethers, having tried every form of sanction or cajoling that they, or professionals around them, can propose and still that development of empathy and order in their young people's lives has lagged behind that of their peers. I have seen families in which there are siblings who have developed mature reasoning (under the influence of the same parents and circumstances) at extraordinarily different rates.
But like RhD says, in the vast majority of cases, the kids are alright in the end, it is just an uncomfortable journey to get there.
So can we please have the humility to admit that we know nothing of the family in question, and have no confidence beyond presumption in passing comment on them.
And equally that we have no knowledge beyond this one situation, under stress, of how van der Poel conducts himself usually, and so we don't really have any grounds to extrapolate from opinions of how he behaved last Saturday night to anything in future races.