Keyboard Vs Mouse

Why using the keyboard to navigate the internet or the computer???
Why not using the mouse? It is simpler, and faster!
Are people trying to not use the mouse are just crazy geeks who want to show off???

When using the mouse you have just one remaining hand for typing on the keyboard, and since you need the other hand for typing correctly you have to let go of the mouse temporarily. You then go back and forth to the mouse constantly.
The use of the mouse and the keyboard are completely different and the brain have to switch states each time you switch interface.
If you were thinking of taking notes, you would have first to find the application with your mouse in the start menu or the task bar (even the place of the application is not a fixed one so you can be sure you will have to search) then create a new document, then switch to the keyboard and write your idea (idea you may have already forgot since the brain switched states so much).

At first it seems completely unnatural, and maybe plain stupid(since it is slower than with the mouse for at least one day, or a few).
But navigating with keyboard shortcuts has an advantage : you are LEARNING direct actions to things. So when they are learned you don't need to search anymore, you don't need to look for an application, you don't need to look for a button on a taskbar, you don't need to look for an always changing place icon, you don't need to keep you finger pressed all the way on scroll bars, you don't need press several keys to go to the top of a page, or to go to the previous page.
The shortcuts you learned become natural, and since they allow you to act directly and surely on something you use very little brain power. All this process become integrated, like playing the piano, you don't think about the place of the keys of whatever, you only think "MUSIC".
YES, navigating with the keyboard can be compared to playing music while using the mouse can't. I think you got the point.