What would you say to someone who is afraid that a bad actor will find their kids on Discord/Minecraft/4chan and encourage them to commit suicide or shoot up their school?
Listen to your children, give them attention, they are your responsibility, don't give them internet access if you find it unsafe
I would tell them to not give their children internet access at all until they think they are ready. Does it sound realistic? I don't know. From technical point of view certainly realistic, a child doesn't have money / devices of his own