i'm a christian and know the bible well. These types of actions do not match how Jesus instructed us to act. When asked by frustrated tax payers whether they should continue paying the unfair taxes, jesus looked at the coin, asked "who's face is on the coin?" It was Caesar. And he said, "Then give to Caesar what is Caesars, and give to God what is God's."
You see, they thought he was going to affirm their desire to revolt and stop paying their taxes, because in their view, jesus was a rebel and of course he would support people rising up to collectively cut off the flow of tax money to the worst government the world had ever seen? No. Jesus said, no don't do that. Just give it to them. Play the long game. Give up this battle, but win the war.
Similarly, when I as a christian am asked by another christian "shouldn't we ban these books? they have sinful activity"....I say, no. let the books stay where they are. it's a library. if what you believe is true, then mere pieces of paper with drawings and text in them should change nothing. Let God sort it out later. You just live your life.
Jesus was much more interested in the inner life of each person, and he made a specific point of telling people to mind their own business and get their own house in order before worrying about everyone else. He also was very mindful of sin, telling us to "run" from it, almost like harmful radiation. Don't try to change it, don't try to interact with it, don't even try to fight it. Just run away, get away, whatever you have to do.
So perhaps Jesus teaching for parents worried about sinful activities in books, would be to take their kid out of school, and create their own school that doesn't teach that. Which is why I support school vouchers. We as christians should at least be consistent, and our actions should match those of Jesus. These people out there pushing for more intervention, more laws, more authoritarian control towards a theocracy, are IMO not very christ-like. Christians already created the ultimate theocracy in the Catholic church and we all saw how that turned out. We should have learned our lessons from history, but instead people just repeat the same mistakes over and over. And that's all people, not just christians.