Generally speaking, claims that national political figures create violence by talking about problems or issues are nonsense. In almost all cases the problem is a failure to address whatever issue the public are angry about, not people talking about the issue the public are angry about. The public are more than capable of thinking for themselves and suggesting they've somehow been brainwashed into violence by some political figure or other is frankly insulting. I don't blame Farage for what's happened over the last couple of weeks any more than I blamed Starmer or Lammy or anyone else for the BLM riots. Not talking about these things is probably more likely to cause violence - I suspect the majority of people involved in the violence are involved at least partly because they're politically disengaged and believe that voting makes no difference, leaving violence/"direct action" as their only option. I'm also fairly sure that Farage has far less influence in Northern Ireland than he does in England.
It's not a surprise that disorder in Northern Ireland is more serious. They have a history of identity-based political violence and my understanding is that, for all the talk of peace, many of the paramilitaries moved into organised crime once the Troubles ended so they still have the knowledge and likely the weapons to do a lot of damage. I wouldn't be surprised if there were Loyalist paramilitaries involved. I wouldn't be surprised if there were Nationalist paramilitaries involved. In the last year groups like the New Republican Movement and the Irish Citizen Army have released videos threatening violence in response to mass immigration. I think serious civil unrest in western Europe is becoming more and more likely and if I had to guess which country is most likely to see serious violence, perhaps even a sort of civil war, I'd probably go for Ireland.
If I was going to blame anyone for the environment that's been created I would blame the series of recent governments that have adopted policies that led firstly to hundreds of thousands of children being raped and tortured because they were white and weren't muslims, while the authorities looked away because they were too scared of being called racist, and more recently led the police to arrest and handcuff a young white man while he was dying, because his non-white killer had accused him of racism. These are the people who now pretend talking about this is a problem and say violence isn't the answer while refusing to do anything to address the problem people are angry about. If nothing changes I think there will be more violence. I thought Elon Musk was talking nonsense when he predicted civil war 18 months ago. I'm not so sure any more.