Lineker is writing about all of that on Twitter etc.
He isn`t doing it on the TV during sports commentaries etc.
If my boss doesn`t like what I say here on TNUK, about politics etc, should he be able to sack me?
If you dont want to read Linekers opinions about politics, don`t read his Tweets, twits. The complaints about him, have won him and his comments a far bigger audience, and given the topic more headlines than ignoring him.