Why was it a bad idea for the Catholic Church to excommunicate Martin Luther?

He believed the Catholic Church got it wrong on salvation.

Explanation:

Luther believed people were saved by faith alone and that this was the summary of all Christian doctrine, and that the Catholic Church of his day had got this wrong.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.