The most seductive idea
The platform reads the philosopher-king as the most seductive idea in political philosophy: that the wise should rule, that power should belong to knowledge, that the city should be governed by those who genuinely understand the good. Its appeal is obvious and perennial — we want our doctors to know medicine and our navigators to know the sea, so why should we not want our rulers to know the good? Plato's demand that "philosophers become kings" is the purest expression of the hope that politics could be made a matter of knowledge rather than of power and persuasion.
The argument for it
The platform reads the argument as genuinely powerful. If virtue is knowledge and justice a kind of expertise, then the competent ruler is the one who possesses that knowledge, and to entrust power to the ignorant — whether the many in a democracy or the rich in an oligarchy — is to court disaster. The philosopher, having through long education ascended to the knowledge of the Good, is uniquely fit to order the city as he has ordered his own soul. The platform reads the ideal as the logical conclusion of taking seriously the idea that there is a truth about how to live and govern, and that some know it better than others.
The danger
The platform reads the objection as equally powerful and finally decisive. The philosopher-king requires that someone possess certain knowledge of the good — and no one does; what we have instead are people who claim such knowledge. To give absolute power to a claimed expert, with no check because the expert by definition knows best, is the precise formula for tyranny: every despot has presented himself as the one who truly knows what is good for his people. The platform reads the deepest danger as the union of absolute power with the claim to absolute wisdom, which removes the very accountability that protects against the abuse of power.
Plato's own retreat
The platform reads the history of Plato's own movement away from the ideal as its most instructive feature. In the Statesman he concedes that, since the true ruler almost never exists and the claim to his knowledge is so easily abused, the rule of law is the necessary second-best; in the Laws he builds, in detail, a city governed by law rather than by the discretion of the wise. The platform reads this retreat as Plato answering his own ideal — recognising that in a world without philosopher-kings, the impersonal rule of law is safer than the personal rule of any claimed sage. The tension between the two is the subject of law versus personal rule.