The first link seemed like a blog, or something like that.
I read some of the Rolling Stone article, but it was too long. That said, while there may be a lot of truth in what they wrote, I don't really consider RS a source that typically look to for information.
I'm sure there are lots of things that I've bought that are part of, backed by, associated with, etc stuff that I don't agree with. Maybe ignorance is bliss, but I've never really looked that hard into companies that I buy things from. That said, if I find out things about a company that I don't like, I would have no problems looking elsewhere. Not on the same level, but I will not buy anything from Cheaper Than Dirt. I also tend to avoid Midway USA, but that's mostly because of their shipping rates and policies. My choice where I spend my money and one of the freedoms that I enjoy.
In this case, seems like there are a lot of allegations. Seems like anyone with a keyboard and ability to post internet articles or blogs can offer stuff up as fact and seemingly without fear of consequences.
About the gun itself, seems very similar to a Tavor.