You make little sense.
Firstly, you make, yet again, a highly emotive and political judgement by stating that
"they have no right to support a nation..." Why?
Secondly, people support their national team as a matter of course, except the few exceptions and they have that right to support another team, as much as those who have the right of those to support or not to support their team, for instance, the vast majority of Americans who have no idea what the World Cup means, and that their World Series is a joke.