I think you are definitely looking for too much in one person, the problem doesn’t reside in just the presidency. The problem lies more broadly than that… from congressmen and senators that are required to fundraise to be on committees (naturally contributors are looking for something in return.
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To politicians moving from private industry into positions of influence with an agenda, it can’t be an accident that Clarence Thomas left Monsanto, magically became a Supreme Court Justice and ruled in favor of corporations being able to patent life (in turn causing misery and financial hardship for small farmers everywhere) and allowing Monsanto become an absolute untouchable behemoth.