It has become fashionable to attack the international investment system, even for former advocates such as the United States Trade Representative. This Article demonstrates a way forward of how the system may be saved—but not the way its proponents propagate. Because of the uncertainty of an economic justification, a rule of law legitimation is mostly advanced in defense of the international investment system. However, in an investment context, even the rule of law can be too much of a good thing, namely when in conflict with democracy. The Article elaborates how best to reconcile investment protection, rule of law, and democratic government, and concludes that only a thin understanding of the rule of law is acceptable on the international plane from the vantage point of democratic theory. Following from this, the Article advocates for a re-calibration of the standard of review and identifies proportionality testing as the setting screw of choice.