Bitcoin cannot be truly destroyed without a global catastrophe that wipes out pretty much all electricity on the planet.There are many things which could cause the value of Bitcoin to decrease; but it is nearly impossible for Bitcoin to be completely destroyed.Dev's in prison would do very little Outlawing would need to be done in-sync globally; or else the nations that continue to allow it will allow it to prosper even more.In my opinion the way to hurt Bitcoin the most would be to buy an enormous amount and artificially sustain the price at ridiculous levels; get mining difficulty insanely high; and then unload your coins. If the market crashes enough miners will be unprofitable and shut down; causing blocks to not be processed.However it would be possible in such an emergency scenario to hard-fork Bitcoin to lower the difficulty. So an attack like this would cost billions and there is no guarantee Bitcoin wouldn't just route around it.