Your hostility to the Roma is based on two forms of reasoning. The first is that they are on average poor, uneducated, more likely to not have jobs, more likely to be criminals - in other words they perfectly fit the profile of racial minority underclasses.  I think enough commentators have addressed that trope in this thread. The other is the 'once I met a Roma who mugged me' reasoning.  It's a surprisingly popular way of justifying prejudice, surprising because it is so obviously meaningless.  Ever met a Roma who didn't mug you? You mention knowing a nice well educated one - are Roma therefore all nice and well educated?

A few years ago while living in Germany I got to be friends with my neighbour - a fun nice thirty something self-consciously very left wing computer programmer. One evening while drinking wine and smoking weed she mentioned how she'd never met any Jews until she lived in New Jersey for a year or two. Oh great, I thought to myself, next comes the standard left wing German guilt speech - all very admirable, but it does get old when you get it about once a week. But I was wrong. You see she'd had this boss, a Jewish boss, who seems to have been an absolute asshole. You know, she said, I'd never understood why the Nazis hated Jews so much, but now I do - he was greedy, exploitative, vulgar, etc, etc, etc. Of course that doesn't justify what the Nazis did but... Stifling the urge to either hit her over the head or run screaming out of the room I tried to gently point out that living in north Jersey she must have met countless Jews and so on and so forth. But of course it didn't work, it never does. Not with the ones with their stories about Jews, nor with those about lazy, thieving blacks from my relatives, not with the idiots who explain to me that there is no interest in high culture in the US cause nobody they met in their suburban Ohio high school exchange trip cared... But all it is, is finding 'evidence' that will confirm preconceived notions.