[misja111]

> there are conceivable circumstances where the "stock market" can go not just to zero but negative

No there are not. As a shareholder you cannot be held accountable for losses of the company you're holding the shares of. In the worst case, your share becomes worthless.

[patmcc]

>>>As a shareholder you cannot be held accountable for losses of the company

This is true. This could also change on the whim of a government. I don't think that's likely, but in a revolution? Who can say.

[nologic01]

imagine a scenario where a pitchfork crowd is banging outside your doors claiming you are owning stock in an abominable entity

you frantically try to sell but there are no buyers at any positive price

finally a dodgy person shows up and is willing to "relieve" you of your stock, but at a price