Just about all titans/founders of business have that same trait like a shark circling around chum. The McDonald brothers didn't have that ruthless trait and should have stayed a local business.
In the end IMHO that did not justify Ray Kroc stealing there business from them and purposely running them out of business. I feel it is hard to have any respect for Ray Kroc after seeing The Founder. That being said I am looking to add this movie to my collection hopefully this year given the upgrades I am doing.