What the hell are you talking about. That has never been my experience nor the experience of people I know that have been there within the past 2 years. Don't fearmonger about crime.
That is insane. I'm not like some country bumpkin either, I am from New Orleans and so was my entire group. We didn't get robbed because we had to become physically aggressive with these groups of people and get in shoving matches and shit. It was ridiculous.
I have never experienced so much rampant theft in my life and I am fairly well traveled.
There are beautiful sights in Barcelona, but I doubt I will ever go back because it is completely lawless.
I have had gun fights happen right outside my house in New Orleans, almost everyone I know was mugged at some point growing up, there was an attempted rape in my driveway once, but it still has nothing on the volume of crime I witnessed in Barcelona.