Besides being messy, dying by train means that Ove's life will be taken by the exact thing that gave him a life as a youth. When Ove saves the man in the suit, he places doing the right thing and helping people above adhering to his plan and his rules. Notice too that as Ove saves the man, he mobilizes others on the platform to work together to do so. Ove is a natural leader when there's a task to be done.