Harry, despite your privileged insight into Voldemort's world (which, incidentally, is a gift any Death Eater would kill to have), you have never been seduced by the Dark Arts, never, even for a second, shown the slightest desire to become one of Voldemort's followers!
A clean cauldron keeps potions from becoming poisons and antidotes are anti-don'ts unless approved by a qualified healer.
Fear of a name increases fear of the thing itself.
Imagine losing fingernails, Harry! That really puts our sufferings into perspective, doesn't it?
Harry Potter set Dobby free!
Were there really shops that sold spell books and broomsticks? Might this not all be some huge joke that the Dursleys had cooked up? If Harry hadn't known that the Dursleys had no sense of humor, he might have thought so; yet somehow, even though everything Hagrid had.