To achieve IIHS Top Safety Pick+[1] you have to have front crash prevention, so it's "mandatory" already if you want your car to be perceived as safe.

1. http://www.iihs.org/iihs/ratings/ratings-info/front-crash-pr... 2. http://www.iihs.org/iihs/ratings

Disclaimer - I work for GM, any opinions are my own.