It's not a magical process to look at how similar laws have been used in the past to work out how it'll go down this time. There were plenty of laws on the books designed to harass southern blacks, all perfectly legal, but of course the defense was they applied to whites as well *wink*wink*nudge*nudge*. Just like sodomy laws were selectively enforced against gay men, but nobody cared if a dude was getting blown by a woman because they weren't "sexual deviants." Arizona has made it clear they want to stop illegal immigration and they're using racial profiling to do it by telling cops to ask U.S. citizens with brown skin to prove their citizenship even when they're not being accused of a crime.
Meanwhile, the Arizona legislature is
trying to ban ethnic studies programs and their education department is
targeting teachers with heavy accents. Sure, it's all about border security.
"If you're doing no wrong, you have nothing to fear" is horseshit. We have plenty of people in prison who did nothing wrong except for be poor and unable to afford a crack legal team.