Sure let's filter also porn by default, and anything that could be offending, or that might look like copyright infringement. I think there are legitimate ques

Sure let's filter also porn by default, and anything that could be offending, or that might look like copyright infringement. I think there are legitimate questions: at which point would it become not acceptable for you? who decides what is blocked? should it be enabled by default? Also if the ISP is in the business of "editorializing" what the user sees, maybe it becomes actually responsible for the content (no safe harbor). That also seems like a dangerous game for them.