What do sociologists call behaviours that are rational for any given individual but that lead to disaster for an entire group?

Answer:Social Dilemmas

Explanation:

Social dilemmas exist when there is conflict on whether an individual should follow their own personal interest or the interest of the collective group.

It is very difficult because an individual will always be tempted to act on their own interest however acting on everyone's interest may benefits many people in long term period.

Social Dilemmas

Explanation:

Social dilemma is a collective action situation in which there is a conflict between individual and collective interest. It is a situation in which individuals could do better if they either changed their strategies or changed the rules of the game.