There is always going to be "It can also...". I can say that a friend of yours can come to your place and steal a golden ring from your desk.

The volatility concern will eventually go away. Volatility represents people's opinion about Bitcoin. They don't understand it yet. If you look into history, you'll notice that pretty much every new invention goes through this phase. People's first reaction is always the same - "nobody needs it, nobody's going to ever use it".