Do they honestly think if they got through and assaulted asylum seekers they’d be given some kind of prize?
No. They'd want the sight of police cordons and protection around all the centres (because of them) and then have farty Farage blather on about wasted money, risk to women and children (from his thugs) and keep the whole sensation of a pressure cooker going in order to advance his aims.
Remember how Russia does things. Accuse your opponent of doing them. Do them. And then gaslight the world into reporting that what you accused your opponents of is what they were doing.
Best achieved with a captive press. Or a press chasing clicks.