I was one of the original supporters of Cruz, donating when he wanted to jump-start the campaign. I was disappointed, maybe a little outraged that he wants even more H1B Visas. I thought he got badly played on the trade manipulations, and didn't like being talked down to by his FR supporters during that whole thing. But Cruz is bright, he's principled, and seems willing to learn.
But do I fear Trump? Not at all. Look at history. Most people who made a difference and turned things around are imperfect. But they believed in their cause and their mission.
Some of them are still at it.