The reason I say this is because with scout the defensive player will never win an attack. Scout removes any risk factor in attacking. I suggest that scout should cost a good amount of gems. You could also nerf it by removing the garrison and just having the dragons shown etc. Regardless I believe this strongly needs a nerf.
Scout does not remove all risks in an attack. If you scout someone and they have reinforcements, you will not see those reinforcements. You only see the person's own troops, not those who are defending them. So keep some secret reinforcements in your city and you'll win some attacks even if someone hits you. (SOME, NOT ALL...Just those who were strong enough to take you had you not had reinforcements)