Tenure track implies research.
Not really. It’s a good question to ask but the answer is rather simple: R1 institutions stay afloat because of research grants; they need researchers to secure that grant $$.
This is where liberal art universities strive. While their endowments and grants may be lower, their retention and graduation rates may be higher (unsourced opinion). But Unfortunately we’re living in a time where we need both type of institutions and having that choice is good. While i still don’t agree with the rising costs of education, research driven programs are good for future researchers and STEM. Liberal art programs are great for the humanities.