Are screen protectors worth for my 3ds?

[Artwark]

I got screen protectors. But I accidently folded my top screen protector and everytime I stick it, the screen has air bubbles plus I can see the fold I made in my top screen protector. I know its useful for the touch screen but is it worth for the top screen?

Also why have they included a top screen protector as well?

[retrolinkx]

They include a top screen protector because the bottom screen scratched the top screen when the DS is closed.

There isn't really a need to have screen protectors, the only time you ever see the scratches on the top screen is when you shine them into a light. I've had my 3DS since 2011, and the screen is fine, it has scratched, but it's not a big deal.