Background: “Justified Death Attitude (JDA) is imminent and likely paradoxical behavior against self threat to keep of self in modification for elimination of the opponent mentally or physically”the first author defined. The former studies have indicated that Justified Death Attitude Scale (JDAS) has both validity and reliability of the young majority society Shia, but we do not know whether or not it is a valid or reliable scale of minority societies Sunni, Assyrian and the old generation. If it has, can the scale discriminate between the JDA and the poll? Objectives: It is a cross-sectional study to evaluate development of JDAS comprehensively because different generations, multi ethnicities, and social variables affect attitude and cognition persistently. Method: 744 participants (368 male and 376 female) were selected through the convenience sampling method in Tehran, Ilam, Khoram Abad, and Sanandaj. The participants were of the following demographic properties: 528 adult and 216 older adult participants; 538 Shia, 108 Sunni, and 98 Assyrian participants; 460 normal and 284 abnormal participants. Participants carried out the General Health Questionnaire-12 (GHQ-12) and JDAS. 115 answer sheets were cancelled (less than 5%). Results: A Pearson product-moment correlation coefficient, binomial tests, Chi square tests, and Jonckheere-Terpstra tests are performed to analyze the data. Multiethnic studies indicate that JDAS is a valid scale for adult and older adult participants and Shia, Sunni, and Assyrian participants (p>0.05). Meanwhile, attitude and polls are two different phenomena in the collision between capital punishment, the kind of death penalties, the agreement of euthanasia, and kind of euthanasia %61, %57, %56, and %61, respectively, because of different propositional and associative processes. The Chi-square indicates that gender, generations, ethnics, and sanity influence polls significantly. In line with the ethnic model of JDA, ethnics influence legal and medical subscales significantly according to Jonckheere-Terpstra tests. Conclusion: The bases of polls and attitude are conformity and self, respectively. So, the poll coefficient of error is very high to assess social ideas. Although you could find some similarities between polls and attitude, they are different phenomena principally.