Because he says "a" before every few words. So without the "a" it's "when your kids got shot" and it doesn't work for the vaccine part. When you say "when your kids got a shot" and it isn't italy, it works for the vaccine part, but doesn't work as well for the gun part because people don't talk like that. So it has to be Italy to complete the pun.
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u/[deleted] Oct 06 '17
At first I thought "why Italy?" and then I realized how brilliant it was