Comment by michaelt

Right but "Don't kidnap/assassinate the enemy leaders" is often a good policy even when nobody will enforce that rule on you by force.

For example if your country is subject to a terror bombing campaign, it's very tempting to assassinate the one leader who had the power/respect/authority to order the attacks to start but often they're also the only leader who can order the attacks to stop

In the 1970s/1980s presumably the UK could have had IRA leaders Gerry Adams and Martin McGuinness assassinated. But it sure turned out to be useful, in the late 1990s peace process, that the IRA had identifiable, living leaders who could engage in negotiation, sign an agreement, and get the bomb makers to stop making bombs.