Because Divination can't have been their only choice.
What other electives do you think Hogwarts offers to students?
Does Hogwarts offer music classes? (Wizard Rockstars have to start somewhere...)
Art classes? (Someone has to paint magical paintings. Who wants to claim Sir Cadogan?)
Architecture? (Because the Burrow doesn't stand up on its own!)
Magical healing? (Madam Pomfrey has to retire someday.)
What electives would you like to see taught at Hogwarts? What electives would you love to take?
tbh I want to learn healing so I can fix my own mess when something inevitably goes horribly wrong with one of the pranks I pull with Fred and George in my fantasy world.