Research shows that children whose parents who allow them to think end up socially maladjusted in middle school. Sometimes they don't get a date to prom. They're also not considered physically attractive by their peers.
Kids who spend time reading don't spend enough time watching TV. Even if they get in some screen time every day, they do not have enough to truly keep up with their peers.
Kids need lots of sleep. If your child isn't getting the average amount of sleep needed, then you are harming your child's mental abilities. Having your child lie awake with no distractions in a crib is better for hir than allowing hir to play on the computer. We all know that unsupervised screen time is harmful to children.
Allowing one's child to think is also harmful to parents. They are branded, "pushy," and socially condemned if they are egotistical enough to talk about their children instead of quietly listening when others talk about theirs.
This public service announcement brought to you by disgruntled grumpies.