jenpax
There are two possibilities.
1) People are often told not to JADE - Justify, Argue, Defend, Explain. JADEing tells people that they have the option to disagree with you. It's easier just to say, "Here's what's going to happen. Here are the boundaries. End of."
2) It's possible in some cases that the reason for the estrangement was actually discussed, but the person didn't agree with it, didn't listen, or simply chose not to mention it.
BBC Radio 4Extra Scheduling Shake-Up.