Japan has no mass shootings and almost 0 gun violence. Is that because they have fewer doors?

Apparently, according to Ted Cruz and the GOP, the solution to gun violence is fewer doors. So does Japan have fewer doors?
Doesnt the GOP know that you never go full retard?
Doesn't the GOP know that you never go full retard?
Japan has no mass shootings and almost 0 gun violence. Is that because they have fewer doors?
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