It is extremely difficult to understand the rationale, if any, behind terror attacks. All terror attacks are the sick acts of deranged, if perversely lucid, people who feel impotent against the society they live in or they unwittingly fight for.
The Norway massacre by this young, pleasant looking monster is particularly horrible because it doesn't seem at first glance to have any explanation or justification, twisted or not. Unfortunately, it is as sickly rational, from a sick mind point of view, as any other terrorist attack.
Historians and intellectuals, fearful of the risk of repeating past atrocities (always perpetrated for the good of humanity of course) have been warning the West's progressives not to push their agendas to their extreme consequences lest they obtain the opposite of what they theoretically wished onto their citizens (racism, concentration camps, deportations, ethnic cleansing); but power, greed and corruption have muddled the original issues and molded them into perfect demagoguery material. The result? Uncontrolled immigration to the detriment (and often discrimination) of the indigenous population for the purpose of creating voting blocks, welfare and all sorts of entitlements to create dependence and passivity and of course more votes, misguided multiculturalism to appease violent minorities, betrayal of hard won ideals (to the point of harsh anti-Semitism, in Norway) for the sake of security, promotion of extreme relativism to undermine societies' institutions, etc., etc., etc..
In a normal democracy, these agendas are eventually moderated through political dialogue or die of their own, either when people see the lies behind the policies or when the nanny state runs out of money. Norway, on the contrary, could afford to drown their citizens in entitlements, accommodate and subsidize fresh immigration and at the same time lull everybody into a false sense of security, thanks to its oil wealth.
Such a state of things eventually creates social conflicts which in normal circumstances generate a healthy, at least in the name of democratic choice, shift in politics and nothing more; as seen recently in most of Europe, including Norway. On the other hand, more serious and dangerous effects are produced on the weakest, or sickest, take your pick, minds. To these, the continuous exposure to such social contradictions exasperates their sense of betrayal, oppression, impotence, producing a desire to sow the horror we have sadly often witnessed, as a lesson, a message, a warning or a cry of desperation; who really knows what goes on in their minds. Someone, either an individual or groups, was bound to exploit the situation. Something was bound to blow up.