the fact that if the wealthy elite acquire more wealth they keep that wealth for themselves and squirrel it away in tax havens
Cash is not wealth.
You can absolutely move cash (from profits, payouts, other windfalls, bonuses, etc) into tax havens in your personal capacity, to avoid paying local taxes on it. Yes, it's technically antisocial behavior, but the amounts involved here are far from the hundreds of billions that economies are collectively valued at.
And if you ever find yourself in a position to do this, you'll realize it's actually in your best financial interests to do so. Over time, these loopholes will eventually close (global co-operation under the FATF, etc), but for the time being, it's the optimal way to secure an inheritance for your future generations.
But you cannot move shares into a tax haven - that's physically impossible. You may as well try posting water to Africa in a cardboard box.
Wealth creation is not enough of itself, but it appears to be the only result of capitalism. Equitable distribution of wealth is also necessary for it to be successful.
Equitable distribution of wealth? Wealth is not a physical, tangible thing like cash is. Wealth is the result of a complicated equation involving ownership, perceived value, future returns, impact on productivity, etc. It's no more possible to equitably distribute wealth as it is to equitably distribute a propensity for 80-hour workweeks.
But sure - let's go with equitable distribution of money, and an extreme illustration. VisualCapitalist.com estimates the world's M2 money supply at $90.4 trillion as of 2017. Spread 100% equitably, disregarding all outstanding debt ($215 trillion) would give each of the 7 billion-odd people in the world a one-time cash lump sum of around $13'000.
If your total assets number anything above $13'000 (pension, cash, stocks, property) you'd of course be required to voluntarily sell this to someone in order to liquidate it, but then you run into the problem of who you're selling this *to*, since nobody with more than $13'000 in assets would be allowed to buy from you (they're also selling).
(But let's ignore financial physics for the sake of this thought experiment.)
First thing that happens when all the people with less than $13'000 receive their cash? They'd most likely spend it on goods and services to improve their earning potential and quality of life, and since we (mostly) live in a world of free choice, not everyone will choose to build or provide those goods and services. So the cash will rapidly accrue back to the people who do, and within a few years we're back to the status quo - having caused several major meltdowns in the process.
If it were at all possible to simply "equitably distribute wealth" and this was indeed the best route to widespread prosperity I'm pretty sure it would have been done by now.