Everybody should eat healthy food
If you live in Utah you should root for the Jazz
You should ride your bike instead of driving to reduce pollution
And so forth
Rooting for BYU is a preference - not a commandment. So I would suggest we avoid morphing this preference into an expectation for all members of the church. Consider a counter point: If members don’t root for BYU they are less of a member? Is it bad? Of course not. So I don’t think being a member means they SHOULD root for BYU. Allow folks to make that choice without an expectation.