complete cast lists

I have always found it interesting that in the US it is difficult to get the complete cast list for a TV program, whereas in other countries it is normal to show it. I can understand that it eats into TV commercial time, but even on websites, it is difficult to get one. I can speculate that in other countries minutiae may be more important, or that in the US viewers do not want to be reminded that drama shows are fantasy. However, I really do not understand it.