Keynesians give regulation. If you're unwilling to consider the ideas of someone who believes that capitalism is reckless, that greed does cause financial crises and that regulation is an answer, then why are you asking for a book recommendation? You should also note that I believe in regulated markets not socialism or communism. There are a million shades of gray here.

>I need a better explanation than hand wringing and worship of Piketty.

Have you read Piketty?

I'm going to recommend two books which should be a gentle introduction to my viewpoint:

23 Things They Don't Tell You About Capitalism by Ha-Joon Chang

Economism: Bad Economics and the Rise of Inequality by James Kwak

EDIT: I'd also note that one of the things that frustrates me most is to see the politicization of economics. The misuse of economic terminology to advocate a specific political viewpoint is exactly what mises and similar institutions engage in and it leads to a group of the public who believes that they're educated in economics when they're actually just inculcated to a political worldview. If you read those books and still disagree, that's fine but just think about whether it's an intelligent disagreement. I've run into so many individuals who know Friedman, Hayek, Mises, Rothbard, maybe Hoppe and no one else. People who explain to me all about how supply and demand lead to market clearing but don't know a single model other than "the free market model" (actually the perfectly competitive model) and definitely don't know its assumptions. People who have never read an empirical/econometric study of economics that did not come with an easy synopsis from a blog they read(and agree with). These people do not know economics, they know politics.