mindkilling is a property of ideologically controversial subjects in general.

Ah I finally clearly see your objection now. I misused the term "mindkiller" in a way that suggested that the "indecent" explanation was the mindkilling one rather than the field or subject itself.

If mindkilling is subtly redefined to mean dissent, people might grow to believe that it is dissent that is the mindkiller, not subjects of political controversy in general, and they should therefore steer clear of it.

Indeed something like this could happen if people where not careful with the usage.

Yes you are right, a different formulation needs to be found otherwise my arguments for why such a situation might be better than pure taboo is mostly invalid in the long run.

I wanted something like: "This is as far as I will go in this contribution on the subject on LessWrong for the sake of the community, but it is by no means the full rationalist approach, if anyone wants to discuss this in private or research it on their own and I would in fact encourage this/there is nothing wrong with that. This subject is pretty mindkilling and so these precautions are needed."