There is many ways people could have have helped dahmer. One of them is, his parents could have paid a lot more attention to their son. For example: Instead of Dahmers parent fighting constantly, and spending all their time with divorce papers, they could have stopped what they were doing, and ask Dahmer how was his day. Creating a strong bond between Dahmers family. When the bond is really strong Dahmer could have opened up, and tell his family what he's was feeling towards his impulsive actions towards animals. That eventually led up to killing humans also Cannibalism innocent people. A second way someone could have helped Dahmer is, his teachers. For example: Dahmer skipped a lot of his classes, spending his time in the schools parking lot to drink tons of beer. His teachers should have been paying a lot more attentions to each student's actions. Once they noticed Dahmer is far from normal, the teachers could have sat down with him, and talk about his actions,which they would most likely suggested him to go to counseling. All the teachers thought that nothing was wrong with him, they really didn't notice Dahmer at all.
As you can tell there is many ways other people could have helped Dahmer, for instance his parent could have helped him,teachers,friends and even strangers,but chose not to. If people took their time to notice Dahmer, then they could have helped him and stopped him