Your example is hyperbolic and inane. An "Uber for contract killing" is already illegal under existing law and such a service would quickly get shut down. Simi

Your example is hyperbolic and inane. An "Uber for contract killing" is already illegal under existing law and such a service would quickly get shut down. Similarly we already have regulations for malicious software and I consider everything else akin to an instrument like a hammer. Just because a hammer can be used to hurt someone doesn't mean we should ban all hammers or require special "hammer licenses" to own one. Another example besides bitcoin is tech like TOR. Some use it to buy drugs; others to evade dictatorial regimes.