This is to say that if you believe the 1974 famine in Bangladesh (which I also discuss below) is indeed a counter example to the optimality of markets for allocating scarce resources without violating natural law, I encourage you to examine the foundational assumptions and theorems in Economics to locate where the error is. That would be big news to a lot of people!
2. In response to: "Disneyland and Apple hardware has its target demographic as the top quartile of the population. The people who spend all their money on basic necessities such as rent, food, water, heat can't ever access these "awesome" services."
The result of capitalism is not that everyone gets the same outcome. The result is that everyone has a better outcome than they would have with a system other than capitalism. This is why I above mention that if we could modify the laws of physics, we could do better than capitalism. Put another way: you and I do not have private jets. But we also wouldn't in any other system, at least on average. That's not a fault with axioms of capitalism, that'a a fault with the laws of physics (if only metal and rocket fuel were plentiful enough!... :p)
3. In response to your examples I generally encourage you to google the benefits of allowing others to speculate ("speculation economic benefits" in google looks good to a first glance). The gist of it is that speculators add liquidity to a market by moving risk to themselves (who demonstrably are happier to hold the risk than the other market participants). My understanding is that most speculation ends in financial loss.
Re: "A particularly chilling example of this would be the 1974 Bangladesh famine, when food production in Bangladesh was at a local peak, yet speculative hoarding of grain drove 1-1.5 million people to starvation."
I'm not so familiar with this example, however looking at Wikipedia (https://en.wikipedia.org/wiki/Bangladesh_famine_of_1974) there seems to have been a major flood following a war in Bangladesh at this time. These seem to be pretty large confounding factors, but let's assume they are not and play a little game:
--> Imagine you're in Bangladesh in 1974, and you are in possession of food enough to feed 100 people for 1 month. How do you decide what to do with this food? Remember that you do not know in advance when the food shortage will recover, and that if you don't save enough, you'll have to buy it at even higher prices or starve. Also, if you give all the food away, another famine may come along in the future, and you will have no capital left over to save those people.
(For a reasonable ethical framework you can use to build an answer, consider reading the material provided for free at https://80000hours.org)
Re: "In 1943, due to a combination of Churchill's policies and hoarding, an estimated 4 million people starved to death."
I've often wondered by people use famines which happen in freer markets as examples, while ignoring the tremendous numbers of famines and shortages that happen through government intervention. Thank you for listing one.
4. For an example of what happens when scarcity occurs and speculators / hoarders aren't allowed to operate, consider the current situation in Venezuela https://en.wikipedia.org/wiki/Shortages_in_Venezuela . You can also find the a tremendous number of (Godwin's law skirting) examples from Russia and China (countries which acted similarly to Venezuela). You can find good economic analyses of all of these btw, if you are curious about how they were caused on a mathematical/game-theoretic level, and how to minimize the chance of such shortages happening in the future.