[There's no clear set of rules about who can do magic and how and why. I could give you a good guess about whether or not someone might pick it up easily, but I couldn't tell you exactly why, and I'm not always right. But it works according to patterns. The practice in my world has been overwhelmingly benevolent for years, so spells that accomplish positive effects are easier to learn and create, and spells that accomplish negative effects are harder. Unless you get a lot of people very determined to wreck things, it should be the same way here, and even if you do it'll take a while for the balance to shift.]