The thread starter's age is 15
I believe the term is primacy. Teach them the correct way of thinking from the start rather than trying to change it down the road.
In this case - don't try and pass the buck when it comes to decisions.
For example far too many students and qualified pilots would like weather forecasters to say simply "not suitable for VFR" or "suitable for VFR" so that when it all goes wrong they can turn round and say "but the forecaster said it was OK for VFR".
The pilot in command is the only person who can make the decision and they must shoulder all the responsibility for that decision.
That is not to say that they can not obtain information from other sourses. However, the question was not I believe a request for information.
Remember that group decisions are less risk adverse.....and this could be a classic case of lots of people saying that "hey I can do it in 30 knots" which can be dangerous for those (15 year olds) who are less experienced and need to clearly understand from the start what being pilot in command is all about.
Regards,
DFC