It is very odd, because so much of his behavior was completely logical and rational, while so much of his other simultaneous behavior was utterly insane. It almost makes me wonder if he has brain tumor like Charles Whitmans.

In this instance, Breivik says he knew and knows murdering children was reprehensible, that he would and should be universally vilified for it: Perfectly rational. He then turns around and says he committed what he admits was an atrocity because it was an unavoidably necessary lesser evil to defend Norway and "cultural" (not religious) Christianity from matriarchal multi-cultural "cultural" Marxism: Wholly irrational. The entire case is like that.

The lawyer is merely entering the plea his client instructed, though we might debate whether doing so serves his clients interests as well as will.