Internet Service Providers are not there to enforce the law. They are in business to provide internet service. That is the scope of their function. What you want is law enforcement to do their job. There is a serious problem when you think it is okay to have your communications listened in on in the United States. Privacy is a right. There needs to be a warrant to monitor your internet usage.
You want your ISP to monitor you. No oversight, no control. I couldn't do business with a company that monitors everything I do. Unless I already had a means of keeping them from knowing everything that I'm doing.