All of this because Bran didn't listen to his mother.
They all deserve to die. Petty, stupid and vein... they are all wretched.
That said, the war would have happened anyway sooner or later. The Incest-Is-The-Best Twins would have killed King Robert sooner or later, triggering a succession war which would have roped in the North. Even if Bran had not climbed that tower that day most of what happens would have happened anyway in some manner. Had, say Ned not become the Hand and then been captured in the inevitable war - much as was Jamie - then Joffery would still have had him beheaded, against advice of everyone who is not a







. Greyjoy would still have sacked Winterfell when the Starks were not home, because he know which mat they put the spare key under, and Jon would still have gone to the Wall and those events beyond the wall are not (much) influenced by the War of Five Kings in any case. Robb still thinks with his cock and so marries the wrong woman, which still gets everyone killed.
It is not all down to Bran being a bad boy, though he is, but if you are going to be that reductionist you might as well go back to the death of Tyrion's mother. Has she lived the twins probably would never have gotten into incest, among other issues.
I hope all the Starks die before the end, including the little children. But then I hope that of the youngest Lannister's as well. I also hope most of the incidental and secondary characters die. Like the people standing around silently in the background. I hope they die.
I do like the series more than the books, but then I dislike the books because it takes forever for George Double-R to get to the point.