I wonder how hard the Roma have tried to assimilate into the various countries where they live. Do they want to assimilate? Are they allowed to assimilate? It is a complex problem in much the same way as trying to explain why black on white crime is so much higher in the US than white on black even when accounting for the population differences.
I hesitate to talk about some things that you mention because most Americans are really really really neurotics about race. (I’m thankful I escaped some of that by travelling as a child.) It’s not just the liberals either. It’s obviously been traumatic to the country as a whole - and with slavery, jim crow, the 70’s I can understand why. For America I think the answer is a little different than anything I would ever normally suggest... I think this is the time to let some things lay low and just not poke at them. I think after a few years people will kinda “wake up”, shake their heads, ask “WHAT was that all about?”, and be ready to talk sensibly about it. Some wounds are very fresh and some are old - but we need to stop picking at the scabs for all of them for at least a little while.