[cowboysauce]

>Suppose we discovered a 10,000 year old archaeological site with that message. Do you honestly think we would be like, "ok, I guess we won't go digging around to see what this ancient civilization found repulsive and worthy of such hatred?"

If the message is simply: "There is something dangerous here", we'd probably ignore it. If the message is "There is waste from the fission of uranium buried here. It consists primarily of the isotopes I-129, Cs-135, ... Here is how the waste is stored and laid out ...", we'd be much more inclined to listen. That's what the original document proposes as well, that there should be a hierarchy of messages from "There's something dangerous buried here" to detailed descriptions of the nature and composition of the waste.