It's either they wait for the inevitable to happen or to go with the flow, but they are still humane.
If they wait, yes they may be safe, but then, especially for the parents, when they saw their children happily playing, would they be able to their children die a gruesome death?
Even if it is not their children, their grandchildren, or their grand grandchildren, their future family too.
One needs to think clearly, and what's more, they could just think; 'What if, after the war, we were immediately seen.
So they just hid there for a few days just to be seen the next day after the war, isn't that pointless too?
In short, they will definitely die if they do nothing or even if they do something, what can they do?
Wang Guan felt worried, but what can an ant do to fight dragons?