I feel that Lenny's death was inevitable. Throughout the many years George and Lenny traveled together in search of work, they were never able to find stability because of Lenny's mental disability, which caused him to have poor judgement and violent tendencies. They had a shared dream of owning their own peace of land, but both were handicapped from fulfilling this dream: Lennie because of his disability and the issues it causes and George because he felt a sense of loyalty and responsibility toward Lennie, so he couldn't make the money or have the stability needed to fulfill this dream.
George certainly killed Lennie because it was the only humane thing in light of the alternative bloody murder which would have ensued. However, George had to kill Lennie because he was now out of control and murdering people. Even though it was unintentional, the results were the same. Also, by murdering Lennie, he was not only keeping the world safer, but he was indirectly giving himself a new beginning to possibly live a more normal, stable life. However, I do feel that if Lennie hadn't killed someone, he would have never harmed Lennie to improve his chances of fulfilling a dream.
More than Lenny's death being inevitable, it was foreshadowed in the story. We saw several examples of how Lenny exercised his brute strength without realization that he had the power to really hurt things, to the point of death. First, there is the incident with the lady that he stayed with, and then we hear from George that it is Lenny who is constantly keeping the men from steady work because he does things that force them to run. He kills his puppy on accident and finally he kills Curley's wife. At this point George knows that there is no amount of running that will keep the men from hurting Lenny once they all hear of what has been done and he also knows that none will understand why Lenny doesn't understand the severity of what he's done. In an effort to save Lenny's from the torturous hands of the men on the farm, he does the only thing he knows he can do and that is to tell Lenny a nice story about the rabbits and shoot him so that he doesn't have to endure whatever it is the men might have had in store for him.
Yes, this was an inevitable end to Lenny. Unlike in our time in the time era this novel was written in they were not adept to handle people with mental challanges. They would not have given him a trial and they sure would not have found hiim not guilty by reasons of insanity. Favorably, for mentally challanged people in todays society we are more knowledgeable. We have alternatives, and is now more known about. While Lenny's death was inevitable it is important to remeber that now it is not anymore.