How Do We Keep Our Children Innocent?

Our children are not safe anywhere, not even the public library. I have not gone to our public library since we moved here, three years ago. I have either bought books or done without. This is only one example of what is happening at our libraries. I know about a year or so ago there was someone looking at pornography at the library, right where children were passing by. Everyone knows what it is like to take children to the supermarket, big box store or even book stores. Everywhere you look there is filth and vulgarity, lies and exploitation. I wouldn't dare take them to the beach or a swimming pool, they would get an eye full there. Of course, they would see almost as much just driving down the road or going to the mall. So I ask you, where can we go where our children will not be exposed to blatant sin? Where can we take them where they will not be exposed to people who like to expose themselves? Where can we go where they can retain their innocence?