A question for opponents of the war effort

A couple of days ago Little Green Footballs linked to this:

Insurgents in Iraq detonated an explosives-rigged vehicle with two children in the back seat after US soldiers let it through a Baghdad checkpoint over the weekend, a senior US military official said Tuesday.

The vehicle was stopped at the checkpoint but was allowed through when soldiers saw the children in the back, said Major General Michael Barbero of the Pentagon's Joint Staff.

"Children in the back seat lowered suspicion. We let it move through. They parked the vehicle, and the adults ran out and detonated it with the children in the back," Barbero said.

The general said it was the first time he had seen a report of insurgents using children in suicide bombings. But he said Al-Qaeda in Iraq is changing tactics in response to the tighter controls around the city.

A US defense official said the incident occurred on Sunday in Baghdad's Adhamiyah district, a mixed neighborhood adjacent to Sadr City, which is predominantly Shiite.

After going through the checkpoint, the vehicle parked next to a market across the street from a school, said the official, who asked not to be identified.

"And the two adults were seen to get out of the vehicle, and run from the vehicle, and then followed by the detonation of the vehicle," the official said.

"It killed the two children inside as well as three other civilians in the vicinity. So, a total of five killed, seven injured," the official said.

Calling the people creatures who did this "monsters" is insulting to monsters.  But the news itself is a couple of days old, so it is not the point of this post.  The Left might be skeptical about this story: they never trust US Government or US Military.  But we know that this story is true because it is part of a pattern.  There was this, and this, and this.  There was this Hezbo-Jugend summer camp.  And then there was the story of a British Muslim couple who took their 6-months old baby on a suicide mission and intended to use their baby's bottle to bring the liquid explosives to the airplane.  Here is another link to that story.  So, I think we can conclude that the story of the terrorists using children in a suicide bombing is not an invention of American propaganda.

And now we come to the question that I wanted to ask the opponents of the war effort, which is the point of this post:

Are you prepared to abandon the people of Iraq to the perverted monsters who use children in suicide bombings?

You say we should not have gone there in the first place.  Fine.  But does it mean that we should leave?  You say that if we have not gone there, thing like this one would not be happening over there.  It is arguable, but for the sake of this question I'll give you that.  Again, does it mean that we should leave?  I was always taught as a kid that if I break something, I have to fix it.  So, why doesn't it applies to Iraq?  Are you prepared to say that it is not our business?  You call yourselves "liberals" and claim to be compassionate.  So, please explain to me:

How is abandoning the people of Iraq to those monsters consistent with any sort of liberal ideology and compassion?

I'll wait patiently for answers.