Torture:
http://www.cfr.org/international-law/united-states-geneva-co...
Tear Gas:
http://www.washingtonpost.com/news/morning-mix/wp/2014/08/14...
Kyoto Protocol:
https://en.wikipedia.org/wiki/Kyoto_Protocol
Extrajudicial Killings in Drone Strikes:
http://www.theguardian.com/world/2012/jun/21/drone-strikes-i...
Your linked article specifically stated tear gas was still legal for police use under the CWC. An expert rightly points out that this is illogical (and I agree), but it is not a failure.
Also, I should point out that the mace and pepper spray canisters that many people around the world carry for personal protection are also illegal chemical weapons under the CWC if used in combat.
There is a whole lot more illogic and inconsistency to be found between what is legal in something arbitrarily defined as "war" and otherwise, if one delves deep enough into the various treaties and conventions.
I reckon the software will get more and more ubiquitous. You can already download image recognition software, maps, and all the other code you need. How far are we actually from being able to send a drone to do what contract killers used to do?
I agree, however, that if this were to go forward with a military bankroll, the result would be much easier to replicate. I'm particularly struck by this sentence from the letter: "If any major military power pushes ahead with AI weapon development...autonomous weapons will become the Kalashnikovs of tomorrow." That's terrifying.
I think the Kurds and some Syrians would beg to differ.
Should we legalize theft just because people still get pickpocketed?
I'm not suggesting we should ignore it, I'm suggesting that aside from making us feel nice, it's not an effective "solution".
Dismantling a standing army?
Not doing any cyberwarfare R&D?
I don't think either of those are included in the proposal of "ban offensive AI weapons."
This is such a technology leap it's not even funny. I appreciate the signatories' intent here and applaud them for higher level thinking but banning offensive AI first strike or counter strike ability is not going to happen because it puts people that ignore said ban far ahead of you in the ability to deal death department.
The US isn't going to dismantle it's nuclear arms, and neither is any other major power. Same story here, only these weapons are even scarier because of the fact that they are much more flexible.
It's nuclear arms strength without all that gooey radiation mess. AI could do everything from surgical strikes to full on massed combat without losing a countryman and dominating other nations on the battlefield. Nobody is going to get caught flat footed on that one.
It can be done. It happened in South Africa. It was also the subject of considerable debate in the last UK election. We don't have to keep them, as many people recognise they're very expensive for something we have no need for.