Earlier quoted context omitted.
Vanguard is index funds, so the returns are as good (or bad) as the market.
Wouldn't it be a better idea to invest in bonds or more stable sources of investment for the next few years until we can make sure of the impact of Brexit-Trump? I wouldn't be surprised if AAPL and other giant third sector companies fall in value right now.
Passive investing when you have many years before retirement means you worry about long term trends rather than short term risks.