Had she run, the key reason I would have considered voting for someone else in the primaries was the unbounded visciousness of some of her supporters. It’s an illogical response I know, but I’ve never seen such unrelenting, hair-trigger nastiness.
There are plenty of pro Perry nasties on Perry threads.
All candidates have their bad supporters. If you take that as a key reason not to vote for somebody then you've got a problem.