Someone who is barely scraping by is a) the least likely to get hit with more tax, b)most likely to derive benefit over the long term from an economy wide rising tide, and c) most in need to subsidized education that could improve their earning power.

I have extensive first-hand experience of barely scraping by, and reject your analogy of 'pointing a gun at someone'. For things like education and healthcare (which liberals like myself believe to be worth public funding), some compare it to sticking up the weakest and poorest and taxing them farther into poverty, whereas the reality is that those services, which are almost essential for economic security and advancement, are stuck behind a big paywall and those who object to the existence of this wall have guns pointed at them. Yesterday, literally so, in the form of riot guns.

High school graduates have the lowest earning power and the highest rate of unemployment. I don't see the social good in saddling them with tens of thousand in debt so that when they graduate they are forced towards the most lucrative offer. That's how we ended up with a shortage of scientists and engineers and a surplus of quantitative analysts on Wall Street.