I'm noticing a pattern here...
Non-practicing witches/wizards: "Practicing magic is bad. It will make you evil. There is no such thing as harmless magic or good magic. Doing magic is bad! Well...okay, unless I really really need or want to, then it's justified and will be okay."
Practicing witches/wizards: "You non practicers are all hypocrites, magic can get out of control but it's not an inherently bad thing."
I kind of agree with that hypocrite part.I am also sensing some religious undertones with the non-practicers all seeming to be Christian and all practicers being not Christian. Wuh oh.