Let go off the pearls you're clutching for the moment and consider some of these points. 

This topic has bugged me for a MINUTE and though I've discussed it on discord before it was due a deep dive because I'm sick of people projecting their fears onto kids whose dreams and aspirations are just as valid as an adults because newsflash, exploitation doesn't magically stop as an adult either so ... should they not work todays the careers they wish for?

This reminds me of conservatives only caring about foetuses or embryo's but then not giving a shit once the child is here. You either care about exploitation all the way round or you're trying to be controlling but guising it as control cos the adults aren't fairing much better. 

Possibly there's envy for the fact that younger kids have an opportunity to learn and train in a way that is not easily accessible.