My stepson is an alcoholic, crack addict and polysubstance abuser.....
In the past, he has threatened to kill 3 member so his own family, and I alternated between being a "naive s***-kicker" or a "gold digging trophy wife" (woo hoo, I'm a trophy wife!).
He apologized to me once via Facebook, of all things, and his apology was worded so that I was made out to be the bad guy if I wasn't a generous enough person to forgive him.
That is about the best apology I will likely ever receive from him.
It's definitely not wrong to want an apology, but in my experience, it really won't live up to what it truly should be.
Hugs, HG