Few companies are as well resourced to help change the world as Apple but sadly Apple and Cook are doing little with that opportunity.
Sadly, our capitalist system is ill-suited to the kind of altruistic effort you describe. Fiduciary responsibility prevents most corporations from taking risks for the common good.
I have what I call the Elon Musk Rule for Billionaires: If you're doing even 1/10th of the public good as Elon does, then you deserve your billions. But if you're just another hedge-funder, sitting on your Smaug hoard, then you -- or rather the fact that you are a billionaire -- is not doing any good for the rest of us. Furthermore, the fact that you are keeping all that coin in your hoard, and out of circulation, is in fact a detriment to the rest of us. You are nothing more than a blood-sucking parasite with a fancy suit and a Ferrari.
It's worth noting that both SpaceX and Tesla were started as private companies (and SpaceX is still private) precisely because Elon knew he could never get away with such risky behavior as a public corporation.