Apparently Eliezer is actually against throwing around P(doom) numbers: https://www.lesswrong.com/posts/4mBaixwf4k8jk7fG4/yudkowsky-on-don-t-use-p-doom ?
The objections to using P(doom) are relatively reasonable by lesswrong standards... but this is in fact once again all Eliezer's fault. He started a community centered around 1) putting overconfident probability "estimates" on subjective uncertain things 2) need to make a friendly AI-God, he really shouldn't be surprised that people combine the two. Also, he has regularly expressed his certainty that we are all going to die to Skynet in terms of ridiculously overconfident probabilities, he shouldn't be surprised that other people followed suit.