One of my worst experiences as a junior member of our interview team was when a candidate was "walked out" when the hiring manager decided that the person was not going to work out. I still feel embarrassed about it myself. What a terrible experience for the interviewee.
That shit makes me so mad. Bringing people to your office in a truly vulnerable state - they're inviting you to judge them. Anyone who doesn't treat them with compassion and kindness lacks what it takes to be a good leader.
There's a right and wrong to do this.
Some of my worst interview memories are from a company where the VP leading hiring had ideas that candidates needed to be made to feel as comfortable and positive as possible and treated equally, including giving them the same interview length after they got past the screener.
The screener mostly filtered out unqualified candidates, but when someone slipped through and then was obviously not going to make it through the interview we all had to pretend that they were doing a great job and keep pushing through anyway. There was lots of fake encouragement that most candidates could see right through. Really painful for everyone to have to sit through interview sessions when everyone in the room, including the candidate, knows it's not going to work out.