The problem with most critiques of "trickle down economics" is that they tend to define it purely in terms of evidence for something they don't like, i.e. "look at all this money that's moved offshore."
But there's rarely any recognition of the fact that we don't have good case studies for alternatives. We have no idea whether implementing stricter tax policies would have kept the money here or not. It's entirely possible that failure to implement those tax breaks would have meant five times as much money leaving. If that's the case, trickle-down economics are a massive success, because only twenty trillion dollars have moved offshore.
People forget that in democratic countries, there's not really a "stick" option. Just a carrot. You either make it attractive to do business, or big businesses won't play your game. The ultimate example is Venezuala...that's what happens when you take a stick approach in a carrot game. You briefly impress left wing economists by nationalizing industries and giving "the people" a share. NDP and Labour Party types go all gushy for you and make a bunch of public statements about people before profits.
Then private enterprise pulls out because the climate is hostile, and your country falls apart, and the people are holding a nice fat share of nothing. Left wing economics destroy countries. Right wing economics have huge problems and generate inequality and don't take the environment into account very well. But they work on a fundamental level because they run on self-interest to make people organize efficiently.
The famous example is the pencil. No government program to connect logging operations with mills with carbon pressing operations with tin mining with rubber extraction and refinement with manufacturing with shipping and distribution is ever going to work efficiently: attempts to make government coordinate that kind of thing are universally a disaster.
But you take people involved in all the above industries...they may hate each other. They may come from countries that hate each other. They may be exclusively interested in nothing beyond their own pocketbook. But not only do they work together every day, whether they realize it or not, but they've been doing so for generations, with incredible efficiency, because pencils are available for a nickel, everywhere you look.
Well, everywhere except places like Venezuela.