He ruined the lives of two children, so it'd seem like a just to deprive him of his.
Its not like he killed them, they just have a trauma. So no, I dont see how it is supposed to be just.
You've never had a trauma, did you? Those kids will feel the effects for the rest of their life, and this won't be pretty. There were two children who had their lives half destroyed, so I'd say it adds up pretty well.
Except allowing for death penalties has not shown to be an effective deterrent, and it may increase homicides as well.
e: It's also very expensive in the U.S. and the process is agonizing.
Well, I'd say it's a pretty effective deterrent once it's applied. I didn't heard to anybody doing whatever they did again. The fact that U.S. can't even execute a convict without wasting taxpayers money is another thing, but it's not like prison maintenance is cheap, either. Tropico 4 illustrates this well. You can build and maintain a prison, hire policemen and put criminals there for 1000$ each. Or you could have them shot for 500$ and give an unrelated, pompous speech to reduce the respect penalty. The choice is rather obvious.
Oh, and excuse my grim attempts at humor, my government is annoying me again.