Because what they do (and what they influence to get done) affects me far more than what they say or how they behave.
I am definitely the opposite.
I guess I very simplistically view primary roles of congress and president as
- Congress - these people decide the laws, important for them to have very strong opinions that align with their constituents and to fight for their point of view, to argue / convince the other side, negotiate, compromise, etc. to get the best laws that represent what the people of our country want and need - when electing congress representatives, I think it is very important they believe in what I believe, and want to get done what I want to get done
- President - should be the chief executive, the person ensuring the process is fair and everything runs smoothly, they should not be making all of the decisions and really best if they don't impose their opinions at all but rather should work to ensure the best people are in charge of all aspects of the country and defer to their expertise, encourage compromise, represent all Americans, unite all of us as a nation that we can be proud to be a part of - so when electing the President, I don't care about their personal policy beliefs at all, but instead focus on their ability to lead, their ability to unite, and it is vital their behavior is something our children can look up to and emulate, something the world can respect
I don't care if the president is pro-life or pro-choice, or for open borders or closed borders, or for universal healthcare or not, etc. Let my congresspeople represent my interests on those topics. Give me a president that is a leader, a uniter, someone I can point to and be proud to call our president. Is that too much to ask?