If we're stretching the definition of what it means to inspire people to commit horrendous acts in the ways that you do, anyone saying anything is inspiring something of some sort at all times, which might even be true, but then we're having a very abstract debate in any case.

In the end, people who conduct acts of that sort are not right in the head, and that' why they're capable of such deeds. The reason they seemingly do it is just something their mental illness latches on to. That goes for Islamic extremists, racist shooters and other kinds of mass assaulters as well.

Chances are good they'd have done something of the sort anyway, even if the particular motivation that supported their deed(s) hadn't been in their life. They'd probably have encountered something else that would have triggered the aspects of their personality that enabled, if not truly drove them to do it.

I'm not a Zeitgeist kinda person, and my stance towards anarcho-syndicalism is a rather careful one, but: The idea of a world that doesn't produce an excess of broken lives isn't all wrong, and nurturing a society where those with an intrinsic propensity towards violence are met and supported early in their struggles would certainly go a long way.