SIAI's narrow focus on things that "look like HAL" neglects the risks of entities that are formed of humans and computers (and other objects) interacting. These entities already exist, they're already beyond human intelligence, and they're already existential risks.

Indeed, Lesswrong and SIAI are two obvious examples of these entities, and it's not clear at all how to steer them to become Friendly. Increasing individual rationality will help, but we also need to do social engineering - checks and balances and incentives (not just financial, but social incentives such as attention and praise) - and groupware research (e.g. karma and moderation systems, expert aggregation).