"Fair or unfair. University gives extra credit points for those who attend Hillary rallies"
Answer:
The appropriateness of the offer for extra credit is indeterminate. Why? Because we are not told to what kind of course the extra credit applies. It makes no sense at all if it's, say, physics or organic chemistry. It is at least reasonable if it's any number of social science, business, or humanities courses for there are myriad observations one might make at such an event and that are relevant to .those disciplines. Moreover, the appropriateness is indeterminate because we are not told at what school the offer was made. It may be there is no other candidate's rally taking place in the locality.
As for the fairness of the offer itself rather than its appropriateness, it's fair. All students are eligible to receive the points. Attending a rally does not make one a supporter. Attending a rally does not oblige one to voting for Mrs. Clinton. One's not asked to like what one sees and hears at the rally. One is merely informed that if one attends, one will receive extra credit points. Additionally, the points offered are extra credit; thus they are not required to obtain any grade in the course. On that basis too, then, the offer itself is fair.
Fairness and appropriateness are not the same things. I wonder by dint of your having raised this issue, OP, whether what irks you is a matter of equity or some element of what you perceive to be some sort of inappropriateness of the nature of the offer for extra credit.
Frankly, I think that even if one is not a Clinton supporter, going to a Clinton rally would be informative, and being more informed rather than less informed is rarely a bad thing. I think the same thing about a supporter of any candidate going to a rally held by an opposing candidate.
Sidebar:
Having read the linked content. Whoever wrote it should, instead of going to a Clinton rally, go to remedial writing classes. I sure hope whoever wrote that isn't a college student. In fact, I cannot imagine a college admitting someone whose writing skill is that poor.
End of sidebar.