It would not be either of application the theory of the Convergence, because the one that owns common interests does not mean that necessarily all the group has a homogenous conduct. Those were a few that carried out the revenge by the murders and not all the town of the Ejido. What yes it was infected went the justification to the act. The theory of the Contagion can, by as much, to serve to explain the contagion of values but cannot explain the conduct of the mass. Therefore, to explain the behavior of this group of the Ejido, we could make use of the theory of the Theory of the social identity (Tajfel-1971). The tendency is demonstrated to favor to the member of the own group, through the categorisation, comparison of the social identity. The necessity to obtain positive a social identity is the one that causes that we try to differentiate positively to our group with respect to others. If in the comparison process our group leaves favored, we left favored, we obtain positive a social identity.
In the Ejido, exists on the part of the villagers a necessity to maintain positive an identity social to guarantee a positive distintividad of the own category against the others the immigrants by means of a continuous process of competition between groups and categories, which would explain that integration in society of the group of immigrants is not considered absolutely, having maintained a clear distinction between both communities within the same town. In this line of car-categorisation, we found Reicher, that from the reformulation of its initial expositions on this concept, from Theory of car-categorisation of J. Turner (in 80), it happens to speak of made Model of Social Identity (ESIM), emphasizing that the mass events are characterized for being intergroup relations and that, like such, the social identity of the members of the mass and its actions are going to depend on the dynamic ones of these relations.