“All this over one murder?” he said, trying to stifle a yawn.
“No, Vimes. You said it yourself: all this over thousands of years of tension and politics and power struggles. In recent years, things have gone in certain ways, causing power to shift. There are those who would like it to shift back, even if it returns on a tide of blood. Who cares about one dwarf? But if his death can be turned into a casus belli–” here Lord Vetinari looked at Vimes’s sleepy eyes and went on, “–that is, a reason for war, then suddenly he is the most important dwarf in the world.”

– What it’s really about | 
Terry Pratchett, Thud!