I agree with you. I would be extremely uncomfortable knowing that I might be enabling access to child porn. But you might have problems legally if you take any

I agree with you. I would be extremely uncomfortable knowing that I might be enabling access to child porn. But you might have problems legally if you take any responsibility for the kind of traffic that goes through your node. If you try to block anything, that might be implying legally that you have some responsibility for the traffic that goes through the node. So a whitelist would be best, and you better be sure that every single thing on the sites on your whitelist is legal in your home country. For example, Australia has censored a wikileaks page. So you wouldn't want to allow access to that wikileaks page if you were in Australia. Right now, you can use Google to find pirated material. You can even limit the file type to torrents. Google's main defense is that it has legal uses, and it is not responsible for policing files on other sites.