The Football Fan

My first nut-post. Its about being football fan. Its a crime to switch your alliances with one club and support a different club in football. BUT WHY? No one says a thing when a players are transferred, No one says any thing when coaches are changed, No one minds a change in ownership as long as the owner has lots of cash to spend. Why then is a 'fan' the only one not allowed to change sides and has to be called a traitor if he does that? Even the flags, anthems, stadiums and primary sponsors change!!!