Tholian Web--- McCoy was definitely under the influence of the space. I don't know why we even hesitate to attribute his meltdowns to that.
Plato's Stepchildren is great. They were trying to convey just how out of control power with no responsibility can take people, as with Caligula. What's hanging over these scenes is what's coming, the stuff they couldn't actually show on TV. But it was coming. We saw the torture instruments.
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I know from my own life what an awful thing an extreme loss of personal dignity can be. I never had any difficulty getting what those scenes were about, that had Kirk acting like a horse, with he and Spock used as puppets. That's humiliation. It's bad. That's a particularly harsh and bleak moment, going into the commercial, when all this crap is going on, and Parman says to McCoy "How can you let this go on?" I get a chill at that moment, sometimes.