I find it uncomfortable that so many of the arguments focus on practicality and that so few focus on liberty. It almost seems like a forgotten concept.
I agree parents should have the choice for kids using social media, but this example of impracticality is a bit off: cigarettes are illegal for kids in nearly all developed countries.
And yet the things they have done have gone a long way to reducing the real harms caused by smoking.
A 5% spread of harm in a population is better than spread across 80% or 90%, etc. Taking action to reduce the surface area of harm, even if 0% is impractical, is beneficial to a functioning society.