Do you enable the word censorship filter of your Moodle site? I suspect that there is a high chance that you do not. There are many who consider it useless and ethically challenging. Some may have disabled it because it takes up processing time. My guess is that 99% of forum users are well-behaved and post appropriate and politically-correct text in a Moodle forums. After all, forum participants can be identified by their Moodle username. Okay, but what about the renegade 1% for whom profanity may be common-place in their vocabulary? If the technology allows that 1% to post what we would consider as profane words, should we care enough to do something?
Times, they are a-changing. What used to shock us decades ago no longer shocks society at large. Many of our modern movies, if we care to admit it, contain profanity. In the heat of the moment, in his or her excitement or just out of sheer frustration, a forum user might let loose a bomb-word in a forum post. By the time the offense is detected, the damage may have already been done.
So do we really need to enable this feature? In its native form, I would say "no". The first time I enabled it, I set it to censor the word "ass". I then proceeded to create a forum where I used the words "Class" and "Assignment". Those two benign words, common to education, were filtered and were displayed as "Cl***" and "A**ignment". Oh no! I then disabled the filter.
However, if we could modify and improve the existing standard Moodle censorship filter, and depending on the subject that you teach, I would say that there is a case for it. By the way, the Word Censorship settings can be found at: Site Administration > Plugins > Filters.
Figure 1. Enabling the standard Moodle censorhip filter.