i interpreted the breakfast club to be more of a critique on the high school character stereotypes and the way that relates to how adults viewed the youth of that time, how this scrutiny can affect children growing up, and the rebellious nature that arises from it. there are indeed subthreads about how, despite everyone having their struggles and vices, people are able to bond over them and realise they aren't as removed or different from each other and open up a bit more and overcome that kind of divide. (this is probably more what you were thinking)
of course, it's just my interpretation. but i kind of saw the first message as being the bigger one, personally, because of certain conversations that arise in the movie, the opening and ending, and the interactions between the teacher and the janitor with each other and with the kids