It was my understanding that people set their turrets to players only so you can't simply drop an unridden turtle to drain. When at least some are on players only you force them to put themselves more at risk. And the turrets line of fire sometime intersect with the players causing them to get shot off which is where the myth probably got started?
OOOO one more thing about turrets. What's the deal with plants only doing 0 damage to golems?! Kind of makes things even worse for the small tribe