Blindly shoving all your money into Vanguard ETFs is a strategy that works well for almost every individual who's retirement period maxes out at 70 years (for the MMM types). An endowment is a fund of money designed to sustain operations of it's benefactor forever . Not 10 years. Not 50 years. Literally forever. When you're operating on an indefinite timescale your idea of "risk" changes considerably. Take a look at…
This does not appear to be true. See page 14 of this paper, which shows the 2008-2009 performance of six privately endowed colleges and universities in New England. The smallest loss was 18%, the largest was 30%. Between January 1, 2008, when the S&P500 was at 1,378.76, and January 1, 2009, when the S&P500 was at 868.58, the S&P500 lost 37%. A reasonable mix of stocks and bonds would have had a similar loss as the endowments.