With pre-verbal children we have to be creative and come up with concrete ways of conveying information about dangers, rather than just giving explicit explanations. (I suggest both.)
A list of some of the real life unintended consequences of limiting children’s screen time.
If, when you were five, your parents had told you that you would thank them later for the coercive education to which they were subjecting you, would you have believed them or not? And what would have made you think that they were lying to you?
If, to you, being a responsible parent requires coercing your children, unfortunately I think that very conviction may itself cause some of the very catastrophes you hope to avoid. Children no more react well to being coercively controlled than we do. Coercion has unintended consequences that most parents do not take into account.
Coercion is stressful because it conflicts with most people’s wider ideas about morality, human relationships, and how to run a society, etc. Unless one mentions children or parenting, everyone agrees that consent-based solutions are better that coercion every time. That theory is held on some level by most people. They just suppress it in their parenting.
You may think you are helping your child learn when you answer your child’s burning question pedagogically, with a question, such as ‘What do you think?’ or ‘How might we find the answer to that?’, but it is more likely to annoy them so much they avoid asking you questions in future.
Parents and teachers do far more to oppress children than the laws do, and could perfectly legally desist from most of this oppression if they so chose. There is no legal requirement upon parents to punish their children for a wide range of perfectly legal activities, yet they choose to anyway. There is no legal requirement upon parents to insist that their children live with them, and yet parents whose children seek other guardians usually invoke their legal right to force the children to return. There is no legal requirement to deny children freedom of association, and yet many parents do deny their children that. There is no legal requirement to assault children, yet, in the name of discipline, many parents do so. There is no legal requirement to deny children access to information in the home, yet many parents go to extreme lengths to do so. There is no legal requirement upon parents to subject unwilling children to extra-curricular activities such as piano lessons and Girl Guides. Indeed, there is no legal requirement for parents to force their children to go to school, yet most do.