I do not think anyone can destroy bitcoin. Because it is safe and well developed currency. When most of people sell it, the price will drop, when most of people buy it, the price will go up. I think bitcoin will survive much more.
I guess the one who created bitcoin is the only one who can destroy bitcoin. He knew everything about bitcoin. He knew the upside and the downside of it. If he really wanted to destroy bitcoin, well he can really do that. He has that ability to destroy it. Aside from him, no one can destroy bitcoin even the government. Well, that is just my opinion.