That's because the Roma that have emigrated from Romania are usually up to no good wherever they go. It's not that there aren't respectable Roma... it's because they don't want to change and adapt to society. Right now in Romania, I think 60% of the Roma population is employed; but their numbers are rapidly growing (and gods, do they have us Romanian nationals beat at natality rates ^^;;;) and about half of the criminal elements in our society happen to be of Roma nationality. Don't ask em why that is - maybe it's in their genes, or maybe they've gotten away with it so many times in the past that they will not change.

It sounds like you are rehearsing anti-Roma stereotypes, with a healthy dollop of racism, in the comments to a blog post for International Blog Against Racism Week. You are asserting negative things about a group of people without any proof and then suggesting that it's possibly genetic. I am frankly pretty horrified that you don't even hear this as racist.