Essentially, if a person reflects upon their own mortality, it can lead to conforming to cultural values and accepting authority. They are also more prone to harshly judge others, and affirm the superiority of their group over other groups.
This tells me two things. First, it explains part of the reason cryonics has a hard time spreading. In order to accept cryonics, people need to think about their death. That in turn makes them want to cling more tightly to their established belief system.
The second thing is that within cryonics, it seems we have a high amount of mortality salience. We are highly aware of death, both in its potentially temporary and potentially permanent forms. This makes us vulnerable to some of the same kinds of thinking we struggle against -- closed-minded adherence to our established beliefs, and the tendency to view any kind of challenge as a hostile threat.
As a solution I guess the best thing we can do is constantly try to be aware of what we are thinking and why. This is a non-rational influence that impacts our emotions heavily, and could interfere with taking the best form of action. Looking at the emotions for what they are -- the predictable side-effects of considering death -- may help us to remain in a more rational frame of mind.
It occurs to me that the cryonics movement and the medical community are both mortality-salient groups, and this may influence the two to be in unnecessary (and potentially disastrous) conflict. In an ideal world, there would already
be doctors regularly performing cryonic stabilizations, leading in turn to better quality and more widespread acceptance. There really is no good apolitical reason for medical professionals not to be involved in cryonics.