Let's go back in time, a few moments before Lennon's murder, Lennon realizes something is wrong with the guy coming up to him. He is afraid, he pulls his .45 and shoots the guy dead.
In dowding's world, we would have Lennon in jail for murder and no parol, or maybe as others said in the "body pool".
You see much like Tony Martin, Lennon had no way of knowing the man's intentions, we know from hindsight what his intentions were. So if Lennon had feared for his life those last moments (did he?), and had shot, you guys would have said "hey, he was just going to take some of your money or property, you are a murderer! Go to jail!" We would not have known the man's true intentions since Lennon protected his own life and stopped the incident.
So I say had Lennon been carrying a gun he would be alive today with people wondering why he isn't in prison.
Wrench