All ETFs and mutual funds have this, I believe it's SEC mandated. Regardless, your points may or may not be true but how something performs in a bull market isn't strictly the point. You need to average your returns over a long timeline.

There is nothing special about Vanguard ETFs, and even if you feel you are diversified there's an old saying that in a severe downturn the correlation of everything goes to 1. So most likely, in a downturn, everything you hold will go down, even if you feel you're diversified. This of course is not a law, just a probability.

(And just as a helpful FYI, both stocks and bonds are securities)