We (Liverpool) have Alexis MacAllister and I am very glad indeed that he wasn't one of the players brandishing the Falklands banner or involved in the brouhaha at the end of the World Cup final. I've heard some fans saying he should have more actively disassociated himself with those actions or tried to stop his teammates, but I think it's a bit unrealistic to expect that of any of the players who were in MacAllister's position. At the same time, I can understand if he is booed by opposing fans because he was a member of that Argentinian team. But I don't have any problem with MacAllister being at Liverpool.
I might feel quite different if the Argentinian player at my club was, for example, Enzo Fernandez, Nahuel Molina or Leandro Paredes, though, as they were at the heart of the disgraceful conduct. Ditto if MacAllister was one of the players who held the Falklands banner at the end of the England match - I don't think he was, but happy to be corrected if I'm wrong about that.