A hacker can theoretically deplete everyone's wallet, or exploit all the coins available, or do other global destructive things in a short order. Therefore, Bitcoin will be worth zero if we are not careful.
Yes, if Bitcoin is found to have a serious flaw and cannot reasonably be useful as a medium of exchange and/or a store of value, then it is worth absolutely nothing since it has no other purpose. (Unless it can be fixed before serious damage occurs. Or reversed altogether.) However, I do not think the people of Venezuela take solace by the fact that at least their paper money can be used as a cheap fuel for a fire, or make paper purses, when things get bad.
Yes, and I do not think that people with crashed Ferrari take solace by the fact that at least their luxury sport car can be used as a cheap scrap metal when things get bad.
So, the point of your logic is exactly what? That fiat monetary "vehicle" is BS because some corrupt governments don't know how to "drive it"?
Perhaps a better analogy is to compare fiat to a Pinto rather than a Lambo. A Pinto could have been wrecked by a bad operator, but it also had a flaw, that could be wrecked no matter how good the driver was.
I'm sorry, but the fiat "proof of debt" system doesn't appear to be sustainable. Once people or governments start defaulting on the debt, it becomes a mess. Even with the collateral, the banks just cannot recoup the losses. There are remedies, but rest assured there will be much pain before the remedies take effect.