I agree in principle but this was (probably) a result of somebody fat-fingering the wrong contact and I do think there's some culpability on either the app or the phone for making that possible to do by mistake. Touch screens are an inherently clumsy interface, and Android in general has a lot of problems with UI elements suddenly moving around without warning as you're clicking on things. And then there's auto correct, UI hanging for several seconds at a time only to suddenly wake up and replay everything that you tried to do while it was non responsive, phantom button presses caused by the device getting too warm, etc.
None of this is meant to excuse these officials for not authenticating everybody in that group or for using highly informal text messages to plan an airstrike of all things.
Ultimately there's no excuse for leaking information when you're at that level of government; I just feel like the app industry needs to take responsibility and fix several obvious, well-known and common UI issues.