He has everything at stake, and Harry doesn't indent to lose any more than he already has. He will win this war, any way he can. The Dark will learn the hard way, that once you open the box, you can't put the demon away.

Sure, the war is over, and the good guys won, happy endings all around. Of course, there are exceptions to any rule, and Mr. Potter seems to be high on that list. All he wants is to be left alone, but its not like that stopped anyone before.