So far.. but it is only just a couple of days later. It took a while for to find Anders Breivik's manifesto and he put it online. We don't know how big of an online presence this killer had. There was a facebook profile that FB pulled down quickly (common practice make it only available to LE) but I recall from some screenshots, if they were legit, it was pretty light on details. Kind of like your stereotypical grandpa's FB page.
As an aside, I wonder if the way-back machine has a copy of his FB page...
YES, it may take a while for a manifesto or association to come to light. That is true. But knowing that does nothing to answer the question, which remains.
There is, according to his brother, something new in this man's character, which his family was totally unaware of. His mother being unaware is pretty normal - Nobody want's their mom to know their nefarious side - But his brother?
That change is going to explain a whole lot. And perhaps from that, a motive can be derived.
If he turns out to indeed be that activist in the pink t-shirt, and a direct tie to liberal left is determined, the motivation would be fairly clear.
But right now, a guy who is well off, an avid hunter, and for all appearance, stable in his life, does not suddenly pop a gasket and shoot 600 people.
This is not a dude that is prone to meth or acid induced psychosis. This is not an outright activist. This is not a dude that is a brick short of a Happy Meal.
This was done with premeditation, and some thought. There has to be a reason.