Libertarians don't, and it's one of the few things Neoliberals are actually right about.

"A rising tide lifts all boats" refers to the fact that giving money to the people on the bottom of the financial pyramid who needs it the most will benefit everybody. Unlike just shoveling it at the already rich, which is what capitalism is designed for.

Infuriatingly, almost none of the Dem leadership actually follow through on this mantra with actual policy, beholden to the rich capitalists as they are.