Not unless you can do so without any expectation whatsoever. Let him know you have learned he is disturbed and tell him you grieve for him and that you are now working at getting past the harm he committed and caused against you...and then stop talking. The letter is not a vent or a rant, just something to let him know you will no longer be tolerating any such behaviour and that you are willing to forgive and leave it all behind if he might ever learn to be the kind of father any child should have.