How do we actually address rampant income inequality?

The poor are still better off. As I posted recently in a near-duplicate thread:

It’s even up for the lowest income quintile, although only a bit. I spent most of the 200’s in the lowest income quintile, and there’s no way I would have traded that for the lowest income quintile in the 70s or 80s, partially due to these increases, but more so due to some of the other quality-of-life changes others have mentioned. So the rest of us can do well even if the rich are getting ludicrously richer. There is no stagnation or decoupling from productivity.

That doesn’t mean it’s all puppies and sunshine. Possible dangers include the feedback loops that septimus mentions. I’ll see if I have time to grab some quotes from the book he mentions, which I read on his recommendation. It’s good. Imperfect, but what isn’t?

Note that the video you link to shows charts for wealth inequality, not income inequality. They’re linked, but not the same thing.