Crazy white shooting: let's restrict rights because all can't be trusted! Crazy Islamist shooting: don't judge all Muslims by one crackpot.
— Razor (@hale_razor) January 8, 2015
What he's saying is that any mass shooting increases calls for gun control—in a way that impacts law-abiding whites hardest, because if you live in the ghetto, you can get an illegal gun.
The Charlie Hebdo staffers had combination locks on the their doors, but as far as I know, no guns.
However, I'd point out two things.
First, the crazed mass shooters aren't necessarily white, whites just get the most press. See The Fulford File | Jezebel: “Have You Noticed That White Dudes Keep Mass Murdering People?” No, We`ve Noticed You Promoting It.
Second, when you get a mass shooting or other mass murder by a non-white, you get a combined push for gun control (of whites) and a concurrent push against "backlash."
See Gun Control—Like Immigration Law, Enforced Only Against Those Who Obey It, and our archives on Immigrant Mass Murder, Gun Control, and Disgruntled Minority Massacre (which will start with this item, so scroll down.)