To what degree can the natural aggressive tendencies of an SLE-Se be calmed/tamed by having an IEI in their life?

Let's say for instance the SLE is very loyal and would do anything to protect those he loves, his friends, family, etc. Including violence against someone he perceived as a threat and who wouldn't back down. Is this just the way he will always be, or would being dualized mellow him a bit?

What do you think?