Most if not all the terrorist-related deaths are attributed to The Troubles that ended in - you guessed that - 1998. It is not possible to attribute the deaths or lack thereof to corporal punishment.

Well, yes, obviously.

But it's even less possible to claim that the lack of severe punishment has increased terrorism, as cedws was saying.

Even when you exclude NI, terrorism is lower now than in the past yet punishments have not become notably more severe.