Because they know that they don't! All this Liberal/Marxist Bull$hit is the “egalitarian wet dream" of the cadre of $hit posing as college professors, who have come to the mistaken conclusion that they alone are the only ones smart enough to tell the rest of us how we should live. If we were to close our "institutions of higher learning" for five years, and force these crapweasels to get real jobs, you would immediately see a difference here.
That’s the hallmark of all leftists — telling everybody else how they should live, what house they should live in, what car they should drive. Just like the Soviet Union.