People should not not make things just because they CAN be abused. But this WILL, inevitably, be abused. And not just a little. The whole idea of making blocks is completely different with this.
Your analogy is like saying you shouldn't not invent things such as a tool for getting through locks just because they can be bad. What use they do have is obviously outweighed by the obvious fact that they will be used badly. When there is more bad than good from something, you should not do/make it. Good things have a limited worth, and should not be made at the expense of making worse things happen.
Maybe someone should get a bunch of people, and have them ALL PM Jiggmin the exact same message at the same time. If he ignores it, do it again. Individual PMs don't work on Jiggmin. Maybe you can get those bunch of people.