In fact often they do not call, as reported by sources on the ground. But even if they called always, tell me, would it be ok for you to receive a call ordering you to abandon your home and belongings within an hour, pending its destruction? Does that make it humane?
Naturally it's not something I'd be looking for. But on continuum of bad things to possibly happen it's far ahead of slowly dying under concrete rubble.
The poster I replied to has suggested the man giving the heads up on bombings should not be doing that: that's what "I just followed orders" sarcastic line implies. Do you agree with that?