wmf's snarky comment aside, I think there is something important here. What's the big markets story this week and last? A bunch of people intentionally acting "irrationally" fuelled by their spite. How much "smash the system" energy can PoS systems accept?
Fundamentally Proof-of-Stake relies on a high-level abstract game theory of social interactions between selfish players.
One of these is not like the other.