1) The faculty member from University A writes an article criticizing University B, without mentioning that University A also has the same problems.
2) The faculty member from University A writes an article criticizing a set of problems, including examples from both University A and B.
The subtle distinction between both #1 and #2 is why people have different opinions on this. Many people consider #1 to be hypocritical and #2 to be fair.
If people can't criticise at all due to some level of hypocrisy (which is separated from the author in this case!) then we all end up in a worse spot.