19 year old here.
I seriously am doubting the justification to any antagonism towards people my age and younger; In fact, I know several prospective and current R/C pilots my age, and they are all phenomenally responsible with their flying. Granted, only a few are flying larger, glow powered ships - they are mainly interested in park flyers due to cost - but I have been suprised more than once with their commitment to safety.
It is a similar case when it comes to building - My first R/C model was a Kadet Senior ARTF, but I spend far more time CA'ing my fingers to balsa than I'd care to allude to.
Many of us simply don't have the time to build, or are not interested...and what is wrong with that? Lets face it, there are not many new tricks to bring outsiders into this hobby, and by making it easier by opening it up to those of us without workshops and countless hours of spare time will help us all in the long run.
...And just to clarify, "Video Games", (Flight Simulator 98 and Il2 1946) are one of the main reasons I became interested in this hobby, so I wouldn't go so far as to say that they have all been detrimental to our hobby!