According to the new Faithful and Discreet Slave, Christ’s warning about the evil slave was referring to a hypothetical situation that could never happen. The word “if” proves it.
Mathew 24:48-51 - “But if ever that evil slave should say in his heart, ‘My master is delaying,’ and should start to beat his fellow slaves and should eat and drink with the confirmed drunkards, the master of that slave will come on a day that he does not expect and in an hour that he does not know, and will punish him with the greatest severity and will assign him his part with the hypocrites. There is where [his] weeping and the gnashing of [his] teeth will be.
However, that is a pretty specific, detailed warning, not some general counsel about mistreating the flock. Historically, in the bible, such a detailed warning was issued as a result of God knowing exactly how things were going to play out.
Remember this one?
Joshua 22: 12,13 - “But if you should turn back at all and you do cleave to what is left of these nations, these that remain with you, and you do form marriage alliances with them and go in among them, and they among you, you should positively know that Jehovah your God will not continue to dispossess these nations on your account; and they must become to you as a trap and as a snare and as a scourge on your flanks and as thorns in your eyes until you have perished off this good ground that Jehovah your God has given you.