With James von Brunn’s attack at the National Holocaust Museum and Scott Roeder’s assisination of Dr Tiller in Kansas, there has been a real push to identify the killers as right or left wing.
With Scott Roeder there was not not much pushback on describing his views as being on the right. Anti-abortion is pretty much found only on the right these days and in fact a primary definition of what it means to be on the right. With James von Brunn the situation is much more murky.