Moderation can mean different things.

There's "moderation" which is about in how you express yourself, and how you communicate with people who see things differently. It involves trying to understand the other person's point of view, and trying to see if maybe there is some kind of bridge to be built.

That's always the right way to go about it.

And there's also the assumption that in any disagreement truth and justice is going to lie somewhere on an intermediate position.

And that is not true. A slaveowner has no property rights over a slave, for example. However, sticking with the first sort of moderation means that you avoid jumping to the assumption that, in any particular dispute, there is no intermediate position to explore. You're trying to give the other party a way out.