Shareholder maximisation is the most fucked up idea ever. Most frustratingly, Adam Smith, supposedly the idol of free market "liberals", would have hated the concept. But then they ignore most of his actual views (e.g. he believed in a very high inheritance tax).
Why don't we see more of that behaviour encouraged? Because for a corporation, this is the hierarchy of priorities:
1 Share holders
2 Compliance & Regulation
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96 People
97 The environment.