Fair point. Still.. these people are snipers with handguns. The easy headshots are pretty laughable.
Also, they outnumbered the guy on the tower.. there was one guy shooting at Maggie/Carol/Carl/Beth.. and they all had rifles -- with scopes -- and a gun for Carl shooting back.
Carl was the only one shooting with a gun that wasn't firing a burst with every shot which would lower accuracy and I am pretty sure Carl would have been damn close to out of range at that angle.
Pull list: Afterlife with Archie, Bodies, Chilling Adventures of Sabrina, Coffin Hill, Dead Boy Detectives, The Fade Out, The Goon, Harley Quinn, Hinterkind, Iron Fist: The Living Weapon,The Maxx Maximized, Miracleman, Ms. Marvel, Multiversity, Rasputin, Rocket Raccoon, Sandman: Overture, Silver Surfer, The Walking Dead, Wonder Woman