Janis recommends caution and sensitivity to the potential that the illusion of morality has to distort decision-making. Individuals and minorities may be hurt unnecessarily. The statement that there is no alternative or that the consequences inevitable need to be challenged. There are always other alternatives with different consequences. In a groupthink situation, one characteristic is that members may submit themselves to self censorship.
Conformity comes into play.
Their attempt to open up discussion is too thin and insubstantial to make a difference to a fierce argument. It is uncomfortable and can be personality humiliating and stressful. We penly voice objections in discussion where everyone is generally in agreement. Where objection is not generally shared it is easy to go along with group opinion and then carp about the group's decision afterwards to friends. The loner becomes excluded and stereotyped.