Liberals can't see beyond the next election (myopic). They also can't see the results of 30 years of "voting blue no matter who," so they lack the ability to learn.
Meanwhile leftists have been saying since Marx that Capitalism is the problem, and voting for your favorite color of Capitalism isn't beneficial to anyone but the Capitalist system. So yes there are that many myopic people, like yourself, who will not only vote for blue capitalism over literally any other action, but they will also come to explicitly leftists spaces and browbeat others to do the same.