Sure, you can say, the tool isn't really the problem, it's how you use it, and if you're using a tool the wrong way, it's not going to be as effective. But on the other hand, tools exist to solve problems, and if it is not clear how to use it effectively, then it is not a well-designed tool. The tool should be designed so that the easiest way to use it is the right way; the design should guide the user. If most of the users of the tool are using it wrong, the design has failed.