I have no doubt that this is true in some cases, but it is not true in others.

If you stage a "debate" between evolutionary scientists and creationists, give both sides equal speaking time, treat both with the same respect and social credibility signals, pretend that both are equally interested in the scientific truth, then you are doing the common good a disfavor.

Because the very framing of the debate is happening in the wrong terms. It just allows people whose true rejection is "it's in the bible" or "God said so" to pretend that they're interested in something else, such as the common good or the scientific truth.

If we had true freedom of religion, the debate about voluntary euthanasia would be over (*). Logically, it's a total no-brainer. To pretend that Catholic spokespeople give two shits about the common good, and calculate some kind of utilitarian calculus and then conclude one way or another, is total bullshit.

This is not their true rejection, and everybody knows it. To let them publicly pretend otherwise is doing the true common good a disfavor, because it allows them to implicitly attack other people's freedom of religion, without explicitly having to say, "Look, that freedom of religion thing is fine as long as everybody obeys our religious demands - but not otherwise."

Because the latter is an open attack on the Schelling point of basic human rights and implies a form of defection that they do not want the rest of society to reciprocate. They are rational, instrumentally, in lying about this and pretending otherwise, but we are irrational, instrumentally, in letting it happen.

(*) There would still be discussion about euthanasaia's legal details, but the fundementals would be obvious. Perhaps it would be illegal for voluntary members of religious organizations who decide it, but that is just another form of consent.