Forty-three people died on Friday in clashes between militias in Libya, as did 22 on Sunday from bombs in Iraq. In Helmand, a return of the Taliban to power is now confidently expected. Why should we care? Why should it feature on our news?

The answer is that we helped to bring it about. Britain's three foreign wars in the past decade were uninvited military interventions to topple installed governments. All have ended in disaster.

In each case – Libya, Iraq and Afghanistan – it was easy to see evil in the prevailing regime. These are bad guys that we need to go after, said the Americans. Yet the removal of law and order from a nation is devastating, however cruel that order may have been. Iraqis today repeat that, whatever the ills of Saddam Hussein, under his rule most ordinary citizens and their families could walk the streets at night without fear of murder or kidnap. Religious differences were tolerated. Iraq should have been an oil-rich modern state. Even the Kurds, scourged by Saddam in the past, enjoyed autonomy and relative peace.

In each of these cases Britain and its allies, chiefly America, intervened to overthrow the army, disband government, dismantle the judiciary and leave militias to run riot. Little or no attempt was made to replace anarchy with a new order. "Nation building" was a fiasco. The British bombs that flattened government buildings in Kabul, Baghdad and Tripoli did not replace them, or those who worked in them. Those who dropped them congratulated themselves on their work and went home.

It is hard to exaggerate the misery and chaos created by so-called "liberal interventionism". It is hard to think of a more immoral foreign policy, roaming the (chiefly Muslim) world, killing people and sowing anarchy. That is why the blood-stained consequence should be splashed across headlines. Those who seek political kudos by visiting violence on foreign peoples should never be allowed to forget their deeds.