Two things can be true:
1. Carano tweeted stupid sheet
2. Who tf cares what a supporting character on a show is tweeting in their spare time.
I can't fathom being the kind of person who cares enough about something someone tweets enough to call for termination of their employment. I'll also never understand why corporations think Twitter trends and hashtags like #FireGinaCarano are at all significant. You are Disney, a few thousand people on Twitter can't hurt you in any significant way and there are probably waaayyy more fans who like her character and think firing her for tweets is stupid.