Is the problem of mindless censoring of content the “mindless” or the “censoring”? Or, as the first comment indicated, it’s not really a problem?
Ignoring that point, Facebook has the right to censor its own platform and, like any human organization, is going to screw it up, sometimes laughably badly.
Freedom of speech only goes so far as the government can't block speech on public land, etc. Private businesses can expel people for using foul language/etc and disrupting other customers.
Also, Pruneyard Shopping Center v. Robins established that "under the California Constitution, individuals may peacefully exercise their right to free speech in parts of private shopping centers regularly held open to the public, subject to reasonable regulations adopted by the shopping centers", and that "under the U.S. Constitution, states can provide their citizens with broader rights in their constitutions than under the federal Constitution, so long as those rights do not infringe on any federal constitutional rights." (Quoting from https://en.wikipedia.org/wiki/Pruneyard_Shopping_Center_v._R... .)
That is, there can be free speech rights even at a private business.