When people claim things like free will is an illusion, as i do, then critics often hit back with "Why expect something so obvious to be false? Why not accept it on face value as you do most everything else int eh world?" etc. etc. This is an appeal to intuition as being a form of (reliable) knowledge.

The issue here is that many, many things in our world are not as they seem. Our interpretation of reality is exactly that an interpretation - and there is no guaranteeing its accuracy. Let me refer you to a great R. Buckminster Fuller quote:

"Everything you've learned ... as "obvious" becomes less and less obvious as you begin to study the universe. For example, there are no solids in the universe. There's not even a suggestion of a solid. There are no absolute continuums. There are no surfaces. There are no straight lines."

As psychologist george Miller puts is:

"Everything you've learned in school as "obvious" becomes less and less obvious as you begin to study the universe. For example, there are no solids in the universe. There's not even a suggestion of a solid. There are no absolute continuums. There are no surfaces. There are no straight lines."

Things in life are not as they seem. Matter is made almost entirely of space, yet objects appear entirely solid to us. This are funny in this here world.

Free will, too.