Out of curiosity, how can a coin be destroyed? Isnt that one of premise of crypto currency that noone can destroy or control your coins?
It is trivial to burn individual coins by sending them to addresses for which no private key is known.
It is possible to destroy a blockchain by corrupting it irremediably, if you can find an exploit in the code base.
It is possible to destroy a currency economy in myriad ways. Many have been proposed in this forum. Others are possible as well, but I am certainly disinclined to publicize any of them.