I would FULLY understand being upset with this if they were banning "M" rated games in general, from anyone. But what they're doing is no different than with R rated movies, Cigerettes, Alcohol, Pornography, etc.
There's a rating system at play for video games. Certain games are listed as Mature. Saying those games rated above the age of a kid can't be bought by the kid doesn't seem like a giant deal to me in the least.
If you, as a parent, want the kid to have the game buy it/rent it for them.
If this was an outright ban, absolutely not. But it seems to be tied to the rating system. Now having a problem with the rating system is a whole other ball and wax, but while we have it I see no reason why this would be a bad thing to have as a general statute. I highly doubt its a huge tax payer drain unless there's super secret investigations going on to find retailers that aren't upholding it, in which case year that's stupid.
There's a lot of government "nanny state" type things to get up in arms about. I really don't see this as one of them.
"I am appalled that somebody who is the nominee...would take that kind of position"
"A court took away a presidency"
"...the brother of a man running for president was the governor of the state..."
It's horrifying because Trump is blunt instead of making overt implications.