I think he was serious problem for them because now I'm starting to see non-internet-familiar folk taking a look at loveshies. Particularly assuming that loveshydom is what caused Elliot's rampage. They're going to start seeing a lot more of the precious persecution that they so heavily count on to define their identities.
Oh come now... As annoying as loves guys may be, they didn't "cause him" or even help mold who he became anymore than feminists, the patriarchy, gun culture, frat boy movies, or any other thing that interest groups try to push as the big problem, that causes mass murders. (Which funny enough also happens to be the same thing as they are proponents/opponents of...)
If you look at his manifesto, you can see that he was so fundamentally screwed up, that his loveshy-tendencies were more of a symptom of the problem, than the problem itself.
It's also pretty clear that he developed his ideas himself, and He didn't come into contact with other loveshys until a year or two ago. A long time after all his crazy was already in place.
If anything he has more in common with SJW than loveshys.
Another thing that's fairly obvious from the whinyfesto, is how autistic he was. One of the most disturbing things were how far removed from reality he was. Well normal peoples reality I guess. He had a full blown Aspies amazing ability to at any given time guesstimate what other people may be thinking, and being so far off the mark that it's hard to be any more wrong.
How far removed from reality was he? Towards the end he describes how it would be possible to make a much better civilization, by getting rid of females, in order to completely remove human sexuality.
"In such a pure world, the mans mind can develop into ever higher heights than before. Future generations will be free to live their lives free of having to worry about the barbarity of sex and women, which will enable them to expand their intelligence, and advance the human race to a state of perfect civilization."
(Yes, he has a halfassed plan on how to accomplish breeding. But it's really dumb and ain't pretty...)
He lives in such complete intellectual and mental isolation, that after having thought deeply about these things for many months, he came up with that creepily weird vision of removing woman, in order to get rid of sexuality, without even for a minute considering that HE WOULD BASICALLY TURN THE WHOLE PLANET GAY!!!