In my own opinion who destroying bitcoin is those who doesnt like bitcoin and those scammers. And, ofcourse those competitors of bitcoin that wants to get rid of, wants to be on top or leading in cryptocurrency.
And the other people who will destroying bitcoin are the users of bitcoin that use bitcoin for something illegal are like (money laundering, support for terrorists and other) the illegal activities will makes bitcoin bad images on the peoples who don't know anything about bitcoin and the peoples will be scary hear about bitcoin without learning what is the bitcoin.