You have no idea what my work time is. But I see if you can't get at the ideas, attacking the man is a good second.
I'm a faculty kid. I have a pretty good idea:
1) It ain't likely that an instructor in a state college can post between 8am and 5pm on a regular basis without cutting into school time and
2) It is not dangerous to do so since the education unions protect all sorts of unproductive activities.
You cannot argue that both statements are correct. You can plead your own special case, though.