The original quote from Yvain was
I suppose the difference is whether you're doing the Intel attack now, or in a hypothetical future in which Intel is making brain simulators that seem likely to become AGI. As someone else mentioned, if we're talking about literally THEY ARE BUILDING SKYNET RIGHT NOW, then violence seems like the right idea."
Emphasis mine. In this original quote, in the hypothetical future, where Intel is building brain simulations that seem likely to become artificial general intelligence, he supports violence. As clear as it can be.
His subsequent re-formulation to make himself look less bad was:
Even Yvain supports violence of AI seems imminent". No, I might support violence if an obviously hostile unstoppable SKYNET-style AI seemed clearly imminent
Now, the caveat here is that he would use brain simulators built in the hypothetical future by Intel to be an example of "an obviously hostile unstoppable SKYNET-style AI" , a clear contradiction (if it was so obvious Intel wouldn't be making those brain emulations)
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.