Wicca (what most people call witchcraft) is like most other religions in that it's not the practice itself that is real, rather it's the practitioner. Can they perform magic? I don't believe so, personally. Can a Wiccan change the way he or she behaves in the world to try to make it a better place? Of course. Everyone can. That's the difference between a Wiccan and some punk-a$$ kid who wants to "hex0r his enemies".
The same thing exists in every major religion I can think of. Christians have a huge number of people who go to church once a week because they believe by doing only this, they'll go to some perfect heaven when they die. These same people are the ones who think gays (or anyone else who isn't exactly like them) are immoral/evil, walk by the guy who asks for some change on the street corner, and screams at me that I'm going to hell because I don't share their beliefs.
It's not what you believe in, how often you go to church, or how much money you donate to further your spiritual path. It's how a person handles him/herself. For every one good, genuinely faithful (regardless of chosen deity) person, there are thousands of those who are religious either because they've been taught to, they're afraid to go against social norms, or just plain crazy (so-called Satanists who don't have a clue what LaVey's idea of the beliefs were).