For what it truly is, that is, a symbol of good luck, it actually is a great choice for a case. However, I do agree that most are not going to know that, or appreciate that, but instead are going to go by their biases. So....while it SHOULD be a great choice, in reality, it is a poor choice.
The "trick" when you see something like this, is to not immediately go to YOUR biases, but to see it in context. If some guy wearing a robe or a turban had that case, I would associate it with good luck. If some guy (or gal) with a shaved head, and a lot of tattoos, some with that symbol or others associated with the Neo-Nazis, then I would think he was symbolizing it with the Nazis and was just to stupid to even know he had it drawn wrong.
You just have to put things in the right, or at least best, perspective you can. If you find yourself always associating things with the worst perspective, well, maybe it's time to take a look at yourself and see why that is.