I thought the point of the funeral was to celebrate and remember the life of the deceased? Why would anyone feel the need to preach at all during the funeral? I assume folsk think "hey I have a captive audience and their hearst are hurting.Let me throw some Jesus at them and tell them they need to get saved".
Personally, I've seen funerals where preachign was done and it made me sick and angry. Some family members are not believers and won't be swayed at a funeral. So instea dof tryign to heal their hurt over their loss...lets offend them while we're at it and tell them they are lost in a backhanded way.
I think we should focus on celebrating the deceased's life at a funeral, do it with class, be loving and just try to connect to the family members. If you leave an impression it may open the door for you to reach them. But to use the death of a loved one as an opportunity to preach
Acts 2:38 and risk offending people who are already hurting? Just seems stupid to me.