Exactly. They would be considered by some (or all?) to have a leftwing slant and therefore be tainted somehow. They are considerably to the left of most American papers for example.
Bear in mind the U.S. has two main political parties; the right-wing one, and the even more right-wing one. The U.S. papers simply can't afford to be centrist or leftist.
The U.S. has two main political parties: the left-wing one in perpetual power, and an incompetent left-wing one that still thinks they can get the outcomes they want through elections (they can't; progressive civil servants run the show).