Ben, meet Ben
Assuming Ben is on the island with Jack, Kate and Hurley, he would seem to be in a position to meet his young self. If he does, he could perhaps tell him a few facts about the future and most importantly tell him that he is still alive at a certain age. Armed with this knowledge, Ben’s actions and personality seem more reasonable. Ben “always has a plan” and always seems calm in the face of death and uncertainty. A hole in my theory would obviously be that he would try and stop Alex’s death, even if he knows it is impossible to change.