Despite no evidence that this actually works. Plus the vast majority of experts on the topic saying it doesn’t work, but also, we’ve tried it and it doesn’t work.
Many countries have tried, some multiple times, and it NEVER worked.
It made rich people richer. That’s why they try again.
I think that's called "trickle down economics"? Which I don't think anyone believes any more is actually a viable thing. People have realised "money makes money". You give the rich more money/less tax, they just get richer at the expense of the less rich.