"My concer [sic] is that pool.ntp.com servers are not policed for accuracy."
But they are monitored and "policed". Stop spreading FUD.
In the last three months (the period where I have detailed data) we've had 4 servers off by more than a second while active in the pool. One of them (only active in the Ukraine and Europe) 4 times, the others just once.
I did the same query for "more than half a second" and got a few more servers, but still less than you can count on two hands.