Basically, because in this moment they have probably the same strength and/or quality and because they have the same chance to win too. So I think a draw seems to be the result that is going to happen, because with Juventus being good in defense but Juventus often find themselves in stalemate to score.
Therefore, I think a draw result for this big match is likely to happen and I am not a fan of Juventus and Napoli. I'm only considering it as a bettor, because for me at this moment Juventus and Napoli are indeed very good at defending so they could have ended the match with a 0-0 draw.