User blog comment:B214/Question and Answers 2/@comment-3965848-20140602173558/@comment-16281343-20140603003420

It's not just the resentment and negative emotions of the past possessors, but also the emotions of the current possessor himself.

If let's say Issei dies and a new possessor appears, Issei will do his best for the current possessor not to be consumed of his hatred and start JD.