It's extremely hard to ban the research worldwide, and then it's extremely hard to enforce such decision.
Firstly, you'll have to convince all the world's governments (btw, there are >200) to pass such laws.
Then, you'll likely have all powerful nations doing the research secretly, because it provides some powerful weaponry / other ways to acquire power; or just out of fear that some other government will do it first.
And even if you somehow managed to pass the law worldwide, and stopped governments from doing research secretly, how would you stop individual researchers?
The humanity hasn't prevented the use of nuclear bombs, and has barely prevented a full-blown nuclear war; while nuclear bombs require national-level industry to produce, and are available to a few countries only. How can we hope to ban something which can be researched and launched in your basement?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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