2016 Ford Focus SE - tore out the front passenger wheel well liner. Can I replace? How bad is to leave it off?

2016 Ford Focus SE - tore out the front passenger wheel well liner. Can I replace? How bad is to leave it off? - 1

"Bad" define bad.
Fact is that the liner prevents ingress of water and dirt as well as high speed pieces of gravel that can do major damage.
I would consider that bad for me and my car and would not drive it at all until fixed.

They are cheap to replace, and easy to install. You might also need to purchase the fasteners to install it (but they are available at any auto parts store).

http://www.partsgeek.com/gbproducts/AC/118418-04083178.html?fp=pp&gbm=a&ad=47362750812

Yes. Up to you.

Can

It protects the inner fender from water and rusting. It is not too hard to replace, depending on the car.