While it's probably too idealistic to be possible, I'd rather try and focus on getting people/society/the world to a state where it doesn't matter if everyone has access (i.e. getting to a place where it doesn't matter if everyone has access to nuclear weapons, guns, chemical weapons, etc., because no-one would have the slightest desire to use them).

As things are at the moment, while supression of a technology has benefits, it seems like a risky long-term solution. All it takes is for a single world-altering technology to slip through the cracks, and a bad actor could then forever change the world with it.