The question and this explanation were posted elsewhere, but initial answers disappeared from the site. I repeat it here hoping it will stay.
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There are several Nobel Physics winners that were honored for their contributions to QM. Many (a majority?) of professional physicists obtained their PhD with dissertations on some topic depending on QM.
The Nobel committee supported and made possible the spread of QM by giving the prize to the hardliners QM. They are not neutral.
Some of the characters in the history of QM already passed away, but many more are supporters and beneficiaries of QM and hold positions that depend on the maintenance of QM as a scientifically valid theory. The more reputable ones expect to enter, and remain in, the long term history of science thanks to their QM discoveries.
They heavily invested time and effort in assimilating the quantum doctrine, are deeply convinced of QM main postulates, and would have obvious conflicts of interests in the trial of any competing model.
Thus they may prefer to ignore, or decline, the call of duty as jurors to the court of science and remain happy thereafter, at least for the time being.
On the other hand, scientists should search the truth above all, at least in theory, so that the question implies a moral dilemma.