Well, no. I do accept that, but I'll give an example.
Let's say that you destroy a piece of information, and three years later. something happens. Perhaps a bomb goes off somewhere.
Where was the information? Why did nobody know about it? Well, you've destroyed the information or you weren't able to stay on top of that particular threat circumstance.
I think it would require extraordinary circumstances to destroy information that the service properly has, because they have an ongoing national security mandate.
From my perspective, if the service takes action and they do something and pass it to the RCMP for an investigation, it's going to end up in a court process, but I think it would be wrong to put an arbitrary time frame on how long the service should maintain it.