Pharoah hurt his own people, plus Pharoah ordered a greater death toll on the Hebrews than God allowed to be inflicted by the plagues.
http://christianthinktank.com/killheir.html
Then, Pharoah hardened his own heart, not God. Pharaoh wasn’t willing to humble himself, even when his own priests and court magicians came to confessing that the Hebrew God was God.
The little I HAVE read, compared to the two replies (so far) warrant a more careful study of the points Pope is (trying to) make
Even more than other parts of the Old Testament, the events of the Exodus have to be considered in the light of Jesus’s passion, death, and resurrection. This is the central event of, well, of everything, and all other events have meaning in relation to it.