If you have one, question if you have a mental illness like autism. If you do have a spinner and autism that's fine. If you don't but you have a fidget spinner, you now do.
[spoiler]I saw a girl with a light up spinner yesterday, there's many reasons that shouldn't exist.[/spoiler]
[spoiler]Edit: spinners are made for people who have autism or ADHD, not for people who want to follow a trend. (I saw a few comments saying I'm ignorant, probably the way I worded it, but I didn't want to offend people who have autism.[/spoiler]