Because it's accurate.In fact, why use the term in the first place?
No. It points out hypocrisy and demonization. Issues like this add nothing. I would certainly hope that bringing up an issue as irrelevant as this does not make you think of "courage of convictions".Surely any sort of partisanship would always be viewed through the eyes of the beholder, which shouldn't come as a shock to anyone familiar with political discussions.
What you call 'hyper-partisanship' might be called 'courage of convictions' by someone else.
It's a useless term and an obvious waste of time and space.