When Zerocash gets in, people who think like me will put money into it, fearing that it will go up because it seems safer since it is layered on top of bitcoin (it is right?).

Nope.

if we are both trying to prevent Xrisk, what matters is how well we do as a whole..

True.

.. and everyone knows that humans are skewed towards being loss averse, so to win we must counteract this aversion.

I don't think that this is true in the investment world any more (let alone with cryptocurrency investments). It is getting to the point where high-risk high-return investments are getting overvalued [in some markets] since many players are looking for them. You seem to be a prime example of this overcorrection phenomena - recommending something purely because it is risky!