Hey, hang on! If there's something wrong with the idea (eg, you think it wouldn't really shield Debian from liability) please explain in more detail.
Vendors of proprietary software use click-through licenses all the time. In part, these agreements are used to shield the vendors from legal liability. Similar agreements give users notification of legal prohibitions, eg on public performance of some DVDs, or unsuitability of material for viewers below the age of eighteen. I don't see why we can't avail ourselves of the same mechanisms, or why they would work for other distributors but not for Debian. It would be prudent to consult legal counsel, to make sure it actually does work the way we want it to, and to make sure everything is phrased just so. But you seem to have some kind of in-principle objection to the idea, even assuming it passes muster with lawyers?