I actually liked the idea of Crawford. I've read the Zombie Survival Guide and World War Z by Max Brooks, and I know you have to be strict and regimented to survive as a group. I definitely wouldn't abandon the elderly though, they would still be useful in terms of cooking food and making things for the group, while the young and fit go out scavenging. And children are the future, you definitely can't get rid of them. So those two things were dumb.
Clem liked Ben, but that is because she is a kid and kids are often wrong about people. She defended the guy on the radio too, and we know he's a psycho. Ben has demonstrated time and time again that he is useless and can't be trusted. If I had the chance I would have killed him as soon as he admitted to being the guy who gave supplies to the bandits. His actions since then (running away when Clem was attacked, not watching Clem despite Lee asking him to do so, taking the axe out of the door) have shown that he can't be trusted. I wouldn't have killed him in cold blood, but choosing not to save him from the zombie was good enough for me.