>At the start of the story he has a legitimate positive agenda--he wants to use science to uncover the secrets of magic. As the story develops, however, he completely loses sight of that goal, and he instead becomes just a passenger in the plot--he competes in Quirrell’s games and goes through school like any other student. When Voldemort starts including Hariezer in his plot, Hariezer floats along in a completely reactive way,etc.

>Not until spoiler dies, near the end of the story, does Hariezer pick up a positive goal again (ending death) and he does absolutely nothing to achieve it