>But I still don't see the need to use the word justify, when all it's talking about is how to arrange the print.

oh boy, I hope I'm not too late. your problem, as I see it, is that you're trying to justify two somewhat disparate current senses of quite an old word. the original sense (a. 1300) of justify, from L. justificare (do justice to), was to try as a judge, to judge; to have jurisdiction over, rule, control, keep in order; to do justice to, treat justly -- this usage is now obsolete. not too much later (a. 1500) another sense was to make exact; to fit or arrange exactly; to adjust to exact shape, size, or position -- this sense is now used only technically; i.e., as type-founder's or printer's jargon. the connection between these senses seems a bit more clear: imposing control or order.