Responsible gun owners do multiple layers of safety. The safety selector is just one of them. Even if it fails, as long as the trigger finger is outside the trigger guard unless engaging targets, the trigger won't go off. Even if it goes off due to a trigger malfunction or the shooter tripping, it won't hit anything as long as the gun is always pointed in a safe direction. There's a reason why the retail cost for $5,000,000 of insurance coverage for firearms-related damage/injury is in the $35 ballpark and wholesale cost is about $15.