what are you responding to? i said winterfell is only one of the seven kingdoms, its a big place geographically, but otherwise its not a worthy effort in murdering your only child, he wasnt going to die, he sent davos back to the wall for supplies, we know he was just sending him away so he wouldnt try to stop stannis from killing shireen, but he also needs supplies, the red god could thaw out the weather maybe?
ok so what if he can, he still has to march to winterfell and siege it with no food or siege weapons. even if you have a mcdonalds and a cabelas sitting right outside the wall, unless you have a way to destroy its fortifications and men inside, you will still die. his best bet was to start back to castle black, or find an ally who hates the boltons to hole up with or not even go to winterfell at the start of winter in the first place.