If I’m remembering correctly, the Rabonim at the time – from among the Tanoim – who were at Kamtza’s party, did and said nothing to prevent Bar Kamtza’s embarrassment. This infuriated Bar Kamtza perhaps even more than Kamtza’s treatment of him.
Raboisai, Rabonim are people. Gedolim are people. People are imperfect, and it is possible that they will transgress. If not, where then did we get the well known and ancient wisdom that the transgression of a great person often gets a greater onesh than that of one who is not on the madrega?
The quasi-deification of anyone is an affront to our tradition. I find it hard to understand how the same people who castigate the Meshichists and the Elokists among Chabad will react with horror at the possibility that someone points out a mistake, omission, or contradiction from/by a gadol. TO me, the fact that such an occurence is rare enough to bear notice testifys to their gadlus, and does not take away from it.