I'm not going to touch the arguments about poverty, the homeless, or criminality, except to say that the only time I've really been concerned about the things I've seen have been in New York. I guess YMMV.
In the area I lived in London for 15 years there were numerous traveller communities. Out of the 50+ I met in person over that time period how many do you think were pleasant? About 4. The rest tried to rob us, intimidate us, bully us, outright harm us, usually all for no reason except, "we are not them". They near literally destroy whatever area they decide to live in. The youngest person to pull a knife on a group of us was an 8yo traveller child. They just don't give a fuck in any sense.
I agree that they behave like this, in part, because they do not feel included as part of "normal" society. But I have to ask: Why in hell would anyone want these people in their society when they behave like this? And so continues the endless circle of crime against society and societies hate against them (which really... is justified?).
So we have this endless circle. To me the question is: Why don't they break this circle? Society offers them help, education, support in varying amounts which is there. They refuse to take it, because they do not appear to want to live under societies rules.
Then you have others come along and say "Well you're Xenophobic". Really? I'm Xenophobic, despite working alongside people of all races, religions, creeds with no problem at all? All because I don't want to be harmed and have my home life made a misery by a shitty person who feels the law and societies rules do not apply to them in any way?
If anything, isn't it they who are xenophobic? As they outright refuse to assimilate into the society they live in in any way, shape or form.
I'll never automatically hate a person because of their birth, that's incredibly stupid. But certain groups I'll be wary of, until they prove which direction (good/bad) they lean, because past experience of that group has taught me to be (and isn't that their fault?). To not be wary seems blind and itself... incredibly stupid.
Oh please, Ok, let's talk about the racism against blacks in US before talking about the alleged European xenophobia.
But yeah, the subway or the train in Paris is absolutely not safe in general, avoid it if you can, rent a car or a bike, you'll enjoy the city way more if you are a tourist that way.
The Roma criminality certainly has to do with poverty, but I'm sorry they also have a specific culture and raised into a specific environment that favor criminal behavior. It's a disservice to dismiss it as "xenophobia" or something else when these people are heavily despised everywhere they go in Europe, and for obvious reasons. It feels like they don't even care about themselves and they have no self-love. There is more than 400 Roma slums around Paris, and when I say slum , I'm talking about the real deal, people leaving in "cardboard houses" in the middle of garbage. I don't think it's normal.