I agree that it may be harsh to sit someone a whole extra game because of a T, but it appears that this is a habitual problem with some of these kids.
It also would seem that it is more than the occasional emotional reaction.
Some of what these kids see on TV in the NBA, makes them believe some of their reactions and attitudes which generate a T, are acceptable.
I think the coach is doing what he needs to do to control his players. More power to him.
If we as officials wouldn't tolerate even the little comments from some of these players, it would be hypocritical of us to question the disciplinary methods of this coach.