So how did he get a gun? Gun laws just don't work.
Criminals can get guns any time they want.
Nut cases with legal guns aren't deterred by the law.
Ergo, gun laws do not work.
Bad people use guns badly, good people use them wisely.
…etc etc etc…
To summarise this line of argument…
(a) we have tight gun control restrictions, but …
(b) some bad people still manage to get hold of guns, therefore …
(c) tight gun control restrictions are pointless, so …
(d) we should give up trying to enforce them, which will …
(e) make it easier for bad people to get hold of guns.
🙄