Earlier quoted context omitted.
If 90% of the press is left leaning, no surprise that 90% of journalists lean left, high and low quality alike.
Um, no, that's not the reason. The people that choose to become journalists often do it for idealistic reasons. They want to enlighten the public about issues they care about. Palestine, for example. Right-wing people generally don't have that many issues they want to tell people about. Everybody already knows how high their taxes are, no journalism needed.
Let me assure you right wing people have as many issues they want to tell people about as left wing people. You might not like them or consider them idealistic, but they do. To be blunt, your comment comes off like you live in a left wing enclave and you have no real human experience with people with differing believes. Which is funny, because that is also how modern journalism comes off - privileged white rich kids at liberal schools who then shuttle down to the equally liberal newsroom, never interacting with half the country.