That's the difference between equity and debt investors. We...

That's the difference between equity and debt investors. We shareholders as equity investors shoulder (nearly all) the risk, but also own all the potential upside too. If things go wrong for secured debt investors, they get most of their capital back, but if things go very right (i.e another 1970s nickel boom), then the upside is almost none for them, just that 7% or whatever coupon rate.

Risk is commensurate with reward in almost all circumstances. Asymmetric risk/reward trades would be quickly arbitraged away by the market. If you want capital stability there are plenty of funds that invest in senior/secured corporate debt around.