Negative Blogs

Read a news story about a part-time Professor in Southern Methodist University (SMU) in Dallas, who lost her job because of her blog (phantomprof.blogspot.com). I looked through it. While it is very well written (she teaches English literature), I cannot help observing how negative she is about everything. She is critical of the students, administration, cafeteria and almost anything she comes across in the campus. Is blog only for releasing ones anger and frustrations? While there certainly is relief in expressing ones frustrations, trying to balance it with positive things in life should be more beneficial to everyone, including the readers.
I do not blame SMU for not renewing her contract (although they have given some other excuse for it). I will not want someone so cynical and critical teaching the students either. The story ends in a positive note- the professor is now flooded with 'offers' including one for a movie deal, and she has signed up with a ‘top agent’. Cheers!