This is a good summary of what happened. I'd add a few more: the wealthy invested more and more into the political system in the past 30-40 years, culiminating

This is a good summary of what happened. I'd add a few more: the wealthy invested more and more into the political system in the past 30-40 years, culiminating in the millions pouring in each year following Citizens United. They use their influence to co-opt government power, allowing them to use regulatory capture to fend off competitors, capture big government contracts from forever wars, and loosen regulations to benefit their own interests. It's a vicious cycle, and if we just use the benefits of a wealth tax to build a larger federal government, that apparatus will only be used against the poor/middle class and for (most of) the wealthy. We have to redistribute this wealth back down to the individual and community level for it to have an effect, since it's harder for ultra-wealthy to co-opt thousands of communities and millions of free-thinking individuals than to co-opt centralized gov power (although manufacturing consent can come into play here).