Their extraordinarily rare shoot down have not served as a defense against our bombing campaigns. It is operationally meaningless.

I think that is correct, but how can defense against a meaningless campaign be meaningful?

Perhaps you can explain the operational meaning of the bombing campaign.

It's not an adequate defence but you should concede that a serious military do not actually want their best pilots and multilmillion dollar war fighting planes shot down? It is at the very least embarrassing.

And not using expiring messages on Signal is important also for record retention requirements.