The Cohen Gadol is not like (L'havdil) the Pope “who never sins”. Before he comes to be M'chaper on Klal Yisroel, he has to be M'chaper on his own sins, and the sins of his wife. He also has to be M'chaper on the Aveiros of the elite part of Klal Yisroel; i.e., the Cohanim (who may have inadvertently eaten Korbanos or entered the Bais Hamikdash while in a state of Tum'ah). It’s a totally different world when you realize that you are doing Teshuva together with our most holy Cohanim, including the #1 Cohen Gadol himself!
You no longer look at yourself like you’re a lowly bum, Chas V'shalom, and a sin doesn’t make you automatically a loser. It is just a stepping stone to further improve yourself and continue heading for greatness. Do you know why accepting Tochacha (rebuke) is so difficult? Because the other person looks to you like he’s “Mr. Good-guy” and you’re the “nobody”; and that hurts!
RSRH Zatzal says that giving Tochacha shouldn’t be done in a condescending way, rather we are all in this together and we all make mistakes. The: מוֹכִיחַ one who gives Tochacha should tell the person he is: מוֹכִיחַ giving Tochacha to, that he can also give back Tochacha when the: מוֹכִיחַ one who gives Tochacha does something wrong. There is no official Tzaddik Gamur and Rasha עַ בַ רְ יָ ין sinner, all are the same. All are always making mistakes.
כִי אָדָם א ין צַדִיק בָאָרֶץ אֲשֶׁר יַעֲשֶה טוֹב וְלֹא יֶחֱטָא קהלת ז כ There does not exist a person who never sinned even once during his entire life. It is interesting that the greatest of all our leaders, Dovid Melech Yisroel, should be Nichshal in a grave sin. And the lowest of the low; what appeared like sinning with an: א שֶׁ ת אִ ישׁ a married woman and killing her husband. Of course, it’s not: כְפְשׁוּטוֹ literally (Chazal), but it was still a supremely
