What moves you to be clutching your pearls over this?

You mean the days before terrorism when all countries were part of international treaties? The US has characterized terrorists like Al-Qaeda and the Taliban as combatants in a war that we are in with them. I suggest you read this article;
[law.berkeley.edu]
"In short, the United States government has concluded that the attacks of September 11 have placed the United States in a state of armed conflict, to which the laws of war apply. It has also determined that members of the al Qaeda terrorist network and the Taliban militia are illegal combatants under the laws of war, and so cannot claim the legal protections and benefits that accrue to legal belligerents, such as prisoner of war status under the Third Geneva Convention of 1949."

How do you deter a suicide bomber? Do you mean back in the day where every country would extradite a bad person? Just how do you propose to have brought this particular terrorist to justice? Did the Americans beheaded by ISIS have a trial? It used to be in war both sides played by the rules, terrorists don't play by any rules. Seems a little unjust to require the US to play by the rules but the terrorists don't have to.

There's a lot of shit wrong with a lot of shit, and this, I'm sorry to say, doesn't move the needle for me anymore. I know that's probably a shitty thing to say, but it's true. Every single person in Afghanistan could get killed by an American drone strike and it wouldn't affect my life as much as say getting a girl pregnant when she no longer had access to abortion services. There's too much that can drastically, negatively impact my life going on that I just don't have enough givable fucks to go around anymore.