There's no defending that call. There was CLEAR confusion between the fielders and it was deep enough that even if they dropped it "purposely," there was ZERO chance for a double play and that's what the rule was intended to prohibit.
Indefensible all the way around.
Sorry, but you're wrong here.
The confusion came almost simultaneously with the umpire calling it an infield fly. Up until then, it 100% appeared that Kozma was going to catch the ball.