You don't like cluster munitions, do everything you can to avoid a war with those that use them. If you're not afraid, or your cause is important enough, be ready to live with the consequences, long-lived and hard as they may be.
There is a burden to any policy or decision. If that burden is too high, don't make the decision. The iraqi 'freedom fighters' are practicing this very calculus on the US army right now--trying to win by making an extended occupation too costly to maintain.
When war, in general, becomes too burdensome, then the decision to engage in it will become obsolete. The fact that we never engaged in a nuclear exchange with the USSR speaks pretty well for that.
The day when war is universaly deemed as unreasonably burdensome, it too will become obsolete. Until then, load those submunitions up with rusty nails, bits of broken glass and pig's blood. Do anything you can to make your enemy suffer more than you, and by the greatest possible margin. Otherwise, stick to making greeting cards.