It is funny, in your mind, 4 pool operators would never 51% attack a coin,
because of the financial damage it would cause them.
But you think , Stakeholders would cause direct financial damage to themselves.
I suggest you reexamine your statements, because logically no one wants to harm their-selves financially,
but you think all stakeholders are on financial suicide watch, while all pool operators are not.
You've misunderstood the point.
Pools don't own the hash power. They can't leverage a sustained attack. That would require billions of dollars they don't have. If a handful of pools 51% attacked the network, they would only control the best chain for a matter of hours -- or minutes -- after which their customers would leave with their hash power.
Colluding majority attackers in POS actually own the stake. They can attack the network indefinitely at zero cost. With infinitely lower costs to mount an attack, majority attacks are much more attractive in POS -- assuming there is sufficient value to be gained.
These are apples and oranges.
stakers require closer to 90% to dominate a network.

That doesn't make any sense. Please elaborate.

You also missed the point that the Government can locate any warehouse of ASICS,
merely by having the power company report excessive energy usage,
where as no one can determine the location of a PoS client by it's energy usage alone.
Also a PoS Client could be running off of wireless laptop and moving between alternative locations on a daily basis,
something a warehouse full of ASICS could never do.
This doesn't make up for POS's inferior security model.