You want public servants to be able to do their jobs without fear of time-wasting litigation.
But, if you grant blanket immunity, the poilice (or POTUS) are free to do whatever they want.
We're quite clearly tilted way over into "do what they want" territory.
AFAIK, QI no longer exists in England (not sure about Scotland or N.I.). And Germany never had it (civil cases for damages would be against the state, not the state representative).
Isn’t that the same as QI?
And, given the state of policing and justice in the US, civil litigation is often the only way to get any relief for over-zealous policing. And QI makes that bar even higher than it should be.
Interesting.