I think the trick of this trickle up is that giving money from the 90th percentile (read: affords saving for retirement) to the <50th percentile (read: doesn't

I think the trick of this trickle up is that giving money from the 90th percentile (read: affords saving for retirement) to the <50th percentile (read: doesn't afford saving for retirement) effectively gives money to the >99th percentile (read: affords saving into the blackhole of offshore accounts)