Isn't that always the case?
And does it make a difference?
I feel like we see plenty of situations where politicians would not want to see the market crash, it still does...
I don't doubt politics plays a part, but I'm not at all sure they've got switches that work exactly as desired all the time either...
Also, the invested-ness of US politicians is not just due to them owning stocks, but due to the people voting for them being invested in them by way of invested retirement funds and indirect exposure via government employee pensions.
That's also a permanent thing ...
The Federal reserve is criticized as "undemocratic" but that is why it is independent. Of course by the very nature a government can have sizable influnce on the economy without direct control.
But politicians don't have control of the money supply...