I agree that the talks by SIAI staff at the Singularity Summit which address AI risk reduce x-risk, but it's not clear to me that the Singularity Summit is positive on balance.

Personally I gave up trying to take into account such considerations. Otherwise I would have to weigh the positive and negative effects of comments similar to yours according to influence they might have on existential risks. This quickly leads to chaos theoretic considerations like the butterfly effect which in turn leads to scenarios resembling Pascal's Mugging where tiny probabilities are being outweighed by vast utilities. As a computationally bounded and psychical unstable agent I am unable to cope with that. Consequently I decided to neglect small probability events.