The Netziv says that a person who does a Ma’aseh Ach’zari (cruel act) albeit L'shem Shamayim, he needs a special Bracha to remain a kindhearted person, since a cruel act creates a cruel person. Therefore Hashem gave Pinchos a: בְׂרִ ית שָלוֹם (blessing for peace) for this reason. Either way, we find Pinchos surrounded by Pesukim that portray him as a kind person; first, his lineage is traced to Ahron who symbolizes peace (Chazal call Ahron a shtick (piece of) Chesed and goodness. And now he has: בְׂרִ ית שָלוֹם Bris Shalom.
Despite the special praises and rewards that the Torah gives Pinchos for being a Kano'i, we also get a message that a Kano'i isn't what every hotheaded far’fumter person is; he's full of goodness despite his Kana’us. Chazal say that he was only a Kano'i because he didn't see the lions of Klal Yisroel (Shevet Yehuda & Dan) doing anything.
Novardokers told me that Kana’us is: יָ קָ ר מִ כָ ּל הוֹן more valuable than anything, and should be encouraged, but only together with lots of appropriate Mussar, so you don't turn into an animal, Chas V'shalom. Pinchos (the Kano'i) who is Eliyahu HaNavi remains the: מַ לְׂ אָ ךְ הַ בְׂ רִ ית Malach that comes to a Bris, and always sees good in the Yidden, and he doesn't appear to people who have Hakpados. (Chazal)
