Quote from Robert Heinlein's Lazarus Long
"The second best thing about space travel is that the distance involved
make war very difficult, usually impractical, and almost always
unnecessary. This is propably a loss for most people, since war is our
race's most popular diversion, one which gives purpose and color to dull
and stupid lives. But it is a great boon to the intelligent man who
fights onlt when he must --- never for sport."