I'm sorry, do you actually know about batteries, or do you just casually read about them and now feel obligated to defend a point you tried to make?

The shorting which causes failure is internal, from manufacturing defects. Yes, it's rare. No, it's not something the end user can detect or short protection can stop. This is pretty basic knowledge...hence my questioning (and you totally wooshing on the foil shorting demonstration I pointed out...batteries internally use foil, the foil is what gets hot).

So you have to decide if you want your possible but very rare event to be a small fire or a hydrogen cyanide gas leak.

Also SIBs are a new tech, so who knows what the failure rate will actually look like. Or if CN will even be a concern, the chemistry for mainstream cells might be different.