The goal of "ideal" contact situations, as endorsed by social psychologists such as Gordon Allport, is to reduce prejudice and discrimination between different groups.
According to Allport and other social psychologists, there are certain conditions that need to be present in order for intergroup contact to be effective at reducing prejudice and discrimination. These conditions include equal status between the groups, common goals and activities, cooperative interaction, and support from authorities and institutions.
When these conditions are present, intergroup contact is more likely to lead to positive attitudes and behaviors between different groups, and to reduce prejudice and discrimination. This is the goal of these "ideal" contact situations, which are designed to foster positive interactions between different groups and to reduce negative attitudes and behaviors.