By “innocent” you seem to mean “ignorant of the existance of sin” as opposed to “not guilty of sin”. Parents who are overly concerned about keeping a child of seven “innocent” by the first definition run the risk of failing to strenthen the same child enough to remain “innocent” by the second definition as they grow into adults.
A parent can turn off the TV, ban books and publications, homeschool, and take every precaution to ensure their child only spends time with the “right people”. This will protect them for a while. However, unless you talk to your children about sin, explain what we believe and why, explain what the outside world believes and why it is wrong, and ensure them of God’s protection against it, you aren’t giving them much protection for when they eventually venture outside of the sterilzed bubble you have provided. Sexual sin has become so pervasive in our society, I don’t believe it is wise to pretend it doesn’t exist. There are age-appropriate discussions that can and should be had with a seven-year-old.
