They didn't start this war, she did. Now she's just nuking them all. Everything about this is just whatever she decides to do, and she's got an unstoppable power, so basically if she decides 10,000 people in a field die, they die. They don't have a chance, it's beyond the normal war Westeros usually sees. She shouldn't be that powerful, because she's just demonstrated that she will use it to excess.
Just demonstrated? Lol, wow. This reminds me of the CW shipper controversy. It's these weird motivated delusions.