Other Characters Have Died For Less
One of the biggest causes of death in TWD is hesitation. In a world where zombies roam free, few have the luxury to sit around and think about a decision for long. If you don't act, you die. If you find yourself crippled with fear, you die. For instance, in the shocking midseason premiere, Sam and Jessie suffer gory deaths because they hesitate in the middle of Rick's tense "let's cover ourselves in intestines and march through this giant pack of walkers" plan. They falter, not having the strength or the fortitude to survive. If Carol is impeded at all by her guilt, it could be her ultimate downfall. Negan and his band of merry murderers might not be the ones to take her out, but in that state, a walker easily could.