I've always been a stickler for the notion that objects are morally neutral. This notion usually comes to play in debates about gun prohibition, to counter people essentially claiming that guns are causal determinant for violence in and of themselves, but of course they truly aren't causal determinants...
The theory of a republic is essentially that, in contrast to democracy in which there is tyranny of the majority and in contrast to monarchy in which there is the rule of a single man or oligarchy, the law itself is what rules rather than men. In essence, a republic is supposed to be a model for government...