This is for your own good, may be stated by either, but the Slammer will then compulsively denounce someone else, whereas the Abuser invades your physical person with accusations, fists, groping hands and, this last one must be included, charm. Slammers may engage in slanderous or libelous behavior, and these certainly are crimes, but the bulk of slamming dwells well within the realm of small talk. The next distinction is that Abusers apologize over and over and over again, promising to never repeat the abuse, then they do. Another distinction is that Abusers know they lie. Slammers genuinely believe they are being truthful.
Abusers are more dangerous, true, but their numbers are far less prevalent in our society.
Which leads to my next point. You are far more likely to be the the victim of a Slammer than the victim of an Abuser. Say you work in an office of 100 people. Chances are slim that any of them will ever strike you, call you names or sexually assault you. Given the same context of 100 employees, however, it is quite likely that any number of Slam Clubs exist throughout its ranks.