These particular things are not true!
At my Dad's funeral, I am his daughter, mourning the fact that I no longer have a Daddy.
It is not necessary for YOU to tell me NOW, during my official 'goodbye', that my Daddy was a skirt chasing , gambling, drunk who could not keep a job and support his family. If no other thing can be said, it will be true, that he fathered me. A new chance was born.
It is for respect of the family and those who are grieving a loss.
If you can't find something good to say, IF you are asked to speak.........do not attend.
Again, these things are not true of my Dad.