By keeping everything secret, the enemy doesn't know what the real secrets are. If we were to make less things secret the enemy would know exactly what secrets to go after. What the real secrets are needs to be kept secret.
Ironically, Manning probably did do it in a large part "for the children". Whereas others just give lip service to the children to push their own agendas. Interesting how the idiom "give lip service to the children" sounds a lot like child abuse.
Stewart Baker should be given a dictatorship on a small desolate island with a population of 1. There he can bask in wonderful laws he can keep secret to himself and there won't be any pesky civil liberties to get in the way of his safety.