What they mean by “foolproof” is that only the government has any guns. And when that doesn’t work - criminals seem to REFUSE to obey the law, imagine that - they will pretend that the problem is STILL “the ready access to guns”, even though guns are so restricted that the only way to get one is on the black market.
Even though that is a racist statement, I can take care of that by outlawing, or requiring registration of, anything black. /sarc>