the direction that electricity flows depends on your education (seriously).
I went through a year long course in the Air Force. They teach positive to negative current flow.
I have friends that were taught in the Navy. They taught negative to positive current flow.
Apparently these fine fellows with the blue fuse want you to accept quantum wave theory for the fuse.
I suppose you can trace circuits either the Navy way or the Air Force way and not get injured as long as you stay within a school of thought. What about Air Force planes landing on the deck of a carrier?