I've been hearing about this for weeks, but I dismiss it for the same reason I dismiss other unsubstantiated claims of all kinds, such as, I don't know, Russian hackers backed by Putin messing with the US elections.
Apparently, this whole thing started with some people who got too much free time on their hands taking a look at some of the leaked Podesta emails and noticing some weird uses of pizza and other pizza related words, which does suggest they're actually using it as coffee for something else. I went through some of those emails myself (even though
CNN told me not to) and yeah, the phrasing is certainly suspicious, but going from that to claim that the Clintons and all their associates are involved in some sort of child sex slavery ring is pretty ridiculous.
It's more likely that, just like with the whole spirit cooking thing, the people involved in those emails were referring to some sort of in-joke, and these people had no idea that pedophiles use or have in the past used similar language to talk about their perversions. Which is not to say we should just laugh it off and forget about the whole matter as a crackpot conspiracy, especially if children might be in danger. That said, until a serious investigation is conducted (and as far as I know there really is nothing to grant such a thing) there is no reason for alarm either. And this should go without saying, but even if this somehow turned out to be all true, there's no call for violence and endangering others just to "raise awareness" or whatever, as there's really not many things that might justify such a thing. This person was probably just off his meds or something.