I went to Walmart today and one teen (he looks 14-16) asked if I could buy mature game with his money for him to bypass the age question at register, but I declined his request and told him that I don't want liable for third party purchases - not want to get sued and raise the legal question for civil lawsuit.
Some underage students at Gallaudet asked me to buy alcoholic beverages so I declined them, but they went bullied me and tried to scare me, but not work at all. I will refuse all type of third party purchases to strangers, period.
See FTC data about enforce the rating system.
FTC Undercover Shopper Survey on Enforcement of Entertainment Ratings Finds Compliance Worst for Retailers of Music CDs and the Highest Among Video Game Sellers. Most Areas Show Improvement Since Last Survey
ESRB is more effective to enforce than all other rating systems, especially MPAA and the music. When I was young adult (17-20) so cashiers asked me for ID to buy mature games, but never asked for R-rated movies.
I don't find any legal ramification for movie theater and the movies from retail, so MPAA rating isn't clear as ESRB does. The proposed law is just waste of time and no one will going to enforce, so they are not get my support. I'm predicted that proposed law will shelved in the congress because they are not going waste their time, so all proposed legislation related to games failed.
There are many, many parents disallow their children to play mature games until late childhood or teenage era.
The violent games are existing on market because of customer's demand and game developers collect more money, also teen rated games don't require ID to check and they do have violence involved, similar to PG-13 for MPAA.