We fight God, often, as we rebel against his lordship over out lives. Yet, our creator knows what is best for our good and his glory all along - the problem is our listening, hearing, and humble obedience.
In like manner, we have authority over our children to safeguard them and lead them into what is good for them -- like limiting screen time and destructive influences. We can choose to fight that fight - even though the temptation to let devices have their way with kids seems like the easy solution at the end of a hard day.
Take courage! This article --> here <-- discusses the issue and offers hope and support to parents wrestling with this issue!