LEV550 Before commanding a Jew to rebuke his neighbor for sinning, the Torah says [this verse] that one must not hate one's fellow Jew in one's heart. Therefore, one should not be admonished out of hate, only out of love. If there is any element of hate in the rebuke, it should not be given at all.... According to the Baal HaTanya (Tanya, chap. 32) one should hate the sin in the people, but love all the other parts of the person. In other words, one should hate the sin but love the sinner. There is another reason why the "tactic" of hate is less applicable, if at all, today. At the time of the Talmud and of Maimonides, all Jews lived together in a small community. Even the less observant had no "options" to leave and assimilate. Therefore, the tactic of hating created a very strong pressure to repent and return to the mores and religious values of the overwhelming majority of the community. Today, however, this "tactic" of hating cannot be as effective, since the object of this hatred can merely move away to another Jewish community or, more often, abandon the Jewish community altogether. Therefore, the goal of hatred is almost never successful today. The Mishnah (Avot 1:12) itself implies that the "tactic" of love, not hate, is the means to return a sinner to the proper path, by suggesting that Jews should follow the tradition of Aaron the High Priest, who used the tactics of peace and love to return people to Torah.