Well, maybe we need to decide as a society what exactly enough means. I'd argue that anything above 100m is excessive, especially while other people are literally starving. But sure, let's say anything up until the first billion.

I can't argue the point as well as educated economists can. I'd like to point you to Gabriel Zucman, for instance. What really got me in the end is this: he proposes a 2% wealth tax. It's not a number out of thin air, he actually reasons very well how he got there. You know how much the average billionaire wealth increased over the last years, annually? It's 6%. So it's not even suggesting "you need to have less". It's suggesting "you should accumulate more a little slower than before".

Also, sorry, I really can't emphasise with people who got so used to having a yacht that they cannot imagine life without one anymore. It's peak consumerism, individualism, capitalism. My take is that we need to rethink _some_ things.