Would you support a more generalised warning, though? Perhaps a "WARNING TO PARENTS: wikipedia contains material that some consider unsuitable for children. We would like to encourage everybody to use information responsibly".
The first sentence implies that people who want to protect children from information somehow are especially relevant. What about people who want to protect adults from information? Do we also want a WARNING TO CHINESE VISITORS: Wikipedia contains material that some consider unsuitable for upstanding citizens? There are certainly more concerned Chinese than concerned Americans.
The second sentence isn't NPOV at all, and has little meaning, because the "responsible use" is not defined -- if it is subjective, then we don't need to encourage people to do it.
What I could live with is: "Disclaimer: Wikipedia is an encyclopedia covering a wide range of subjects and as such contains material that some people may consider offensive to themselves, their offspring, their relatives, their friends, their acquaintances and, in some cases, their pets. We do not take any responsibility for alleged emotional, physical or metaphysical harm resulting from use or abuse of this great tome of human knowledge." But I think the short version of this disclaimer is to put a link on the word "encyclopedia". Which, incidentally, is already there.
Regards,
Erik