The core issue is who has the power, who decides. You are thinking of an impersonal entity above all whose freedom to choose the "optimal" solution is unnecessarily constrained by individual rights. The alternative is devolve the power downwards and let different people come to different views and conclusions.

Sure. And we have technical tools that help us solve this problem, rather than just reasoning from moral principles. We can look at the structure of the problem and determine the optimal level of centralization for a particular variety of intervention, because problems are caused by mismatch of optimizer centralization and information centralization, and this can be both that the optimizer is too far up and that the optimizer is too far down.