Photography is not easier to make art, it is just easier to have confidence. We have a natural feeling to find easier to do things we feel confident doing.
"While photography is the easiest medium in which to be confident it is the hardest medium in which to have a distinct personal vision." Chuck Close.
Photography is the easiest form of the art of mimesis "the copy of reality". And is the copy of reality on which people are usually more attract of. And is the copy of reality most people will judge as good quality work.
But when trying to do something else a part from mimesis photography can be even more challenging than other form of art. Because it quite completely copy of reality, especially now a days with digital that most people don't even need to craft their work in order to have a image ready to print, so most people with a camera will be confident that they are doing a good photo as soon as they can see a good image quality (not good art) in their LCD screen.
It means, to go beyond mimesis, painting, sculpture, etc are easier than photography. It also means that to self expression in photography may be more difficult because you have to work with real things that you photograph instead of create images straight from the imaginary. And that's why photography is the hardest medium to have a distinct personal vision.
You don't need much skills to press a button on the automatic camera or to throw paintings or mixing colours on canvas, or even to create shapes in sculpture, as far you can do it with good composition, harmony or even message. But photography and other medias can demand more skills and craft if you want to make something else.
If you ask a child if painting is easy they will tell that it is very easy because they feel confident doing so. Until they grow up and is told that the good stuff looks like things.