I think most of the "liberal appeal", especially to young folks, is the concept of leveling the playing field, taking from those who have "too much" and giving to those who "have too little". The conservative core message is more "a rising tide lifts all boats", which many don't believe of course.
The problem of course is how to tax "wealth", instead of (or in addition to) income. This is why it doesn't happen, Democrats may raise the marginal INCOME TAX rates at bit, the wealthy don't care of course. We end up in a cycle where Reps cut income tax rates, and then Dems might raise it, a little, usually not back to where it was. The reviled "Bush tax cuts" were still in place after 8 years of Obama with a rather small adjustment.
I tend to focus on revenue, not tax "equity". Cut taxes, raise taxes, do whatever, and REVENUE seems to remain the same (as percent of GDP). Revenue is the key. This leads to some very unpopular historical facts that are counterintuitive. You really don't increase REVENUE (much, if any) by raising income tax rates.
Hauser wins again. It's a Laffer to me.