Except for those we purposely bring about through choice, such as marriage partners. Yet, second thoughts make us question old assumptions; Granted the existence of counterparts to begin with, certainly their common goals, though differently expressed, would bring them together when possible. The same would apply to any group. So beneath such gatherings there would be hidden dynamics, psychological activities that could explain the behavior of crowds, political parties, and so forth.
An individual reactions to a given idea or event can vary tremendously, form the most withdrawn behavior to the most explosive.