Well, this is less like evil science and more like evil engineering. The idea that certain types of knowledge should not be pursued is controversial, but the id

Well, this is less like evil science and more like evil engineering. The idea that certain types of knowledge should not be pursued is controversial, but the idea that certain types of things should not be built is less so. There is a scene in the Simpsons where Professor Frink shows off his death ray prototype and is forced to admit that "Well, to be honest, the ray only has evil applications..." This is one of those things, like a poisoned candy bar or a combination baby-rattle-mini-chainsaw, that only has evil applications. It should not be built (not the same thing as saying that you shouldn't be allowed to build it, btw), and if you build it you bear a partial moral (not necessarily legal) responsibility for its use which can't be waved away by saying "I am not responsible for evil uses".