I found myself still wondering this morning about why we seem to feel "safer" focusing more on God's justice than on his goodness. I even brought the matter to my morning meditation. And it because clear very, very quickly: "Justice" has the advantage of being clear and compact--especially when it is a "justice of our own based on law" (which St. Paul lost so much ink discussing). In a justice-relationship, we know what our obligations are; we know "how far" we can go and still remain irreproachable. It doesn't really require that much of us, as long as we stay within the bounds of the law.
Goodness, on the other hand, makes no specific demands of us. Goodness calls for a response of love that gives over everything. If we focus too much on God's goodness, we risk being captivated. We might do crazy things like go, sell what we have, give to the poor, leave all things (in some form or other). You don't know where you could end up. It could seriously mess up our plans and priorities.
Justice keeps things on the level of a transaction. Goodness brings you into a relationship.
The saints knew this, of course. Funny thing: by focusing on justice, we run the risk of having a grim, hard, unyielding attitude, whereas the Saints, who certainly knew God's justice but whose writings tend to emphasize his goodness, were anything but hard and grim (with the possible exception of St. Jerome).
We do god an injustice by focusing more intently on his justice (humanly understood) than on contemplating and praising his goodness. As we say at Mass, "it is right to give him thanks and praise." ("Dignum et iustum est.")