I figure some of the people who secretly took thousands of pictures of unsuspecting children and then spent hundreds of hours poring over those pictures are today still spending many hours looking at pictures of children that should not have been taken.
School systems are like honeypots for pedophiles, and always have been. The less external regulation, the more they are enabled. The more internal authoritarianism, the more they are enabled.
It's like the reason Willy Sutton robbed banks - because that's where the money was. The pedophiles will always want to be in the churches, day care, schools and police uniforms because that's how they can get trusted to touch children without parents around. Some organizations, like the Catholic church, will actually cover up child abuse; how could a pedophile resist the allure of such an environment?
The people who created the school computer spying system had to know the potential for abuse, and the potential liability, but they somehow convinced themselves it was a good idea anyway. That sounds like compulsive behavior to me; rationalizing away the dangers to satisfy an uncontrollable need.