Being a Rat for Leaving the Celtic's?

Remember when Ray Allen left the Celtics to join the Miami Heat’s empire? Well when this happen some of his teammates got pissed off, claiming that he was a rat, that he was not loyal to the team because of his decision. Today those players that disliked Ray Allen’s move are playing for the Brooklyn Nets. They did the same thing. Choosing what’s best for them, their family and their career. You do that move in high school or college I would say that it would be disrespect to your team but these people are businessmen. Their business is their service and wouldn’t you take your service to the place that you had the best offer or benefiting you most? I do understand that those teams that have best chemistry and loyalty are those teams that will win a championship. But if a player is not comfortable with being in a team then it is better off for him to leave.