My impression is that there's a halakha that, if you give food to a Jewish person, you must make him or her make a blessing on the food. If you know that the person will refuse to do so, you may not give the food to begin with. Does the same apply to the bracha acharon or are we free to let people make or not make such a blessing?
Tosfot – Brachot 35a, s.v Tinach l’acharov says that the bracha acharona is considered even more important than the bracha rishona .
Therefore anything that applies to the bracha rishona should also apply to the bracha acharona.