If VIX is volatility index, shouldn’t it also move up when stocks move up?

I mean, shouldn't it measure volatility on both sides? Or buying frenzy isn't considered volatile? On Friday DOW moved up 800 points up but it isn't volatile market behavior? I don't get it.

I see a lot of people say it is being manipulated hard. Who would benefit from VIX manipulation? Market makers? Banks? Why rising VIX bad for the markets? It's just says stocks are being sold, we see it anyway in other indexes and in general we see stocks going down.