This again? Rooting is something that makes an individual feel good. Some people take it a step further than it really is, thinking rooting will makes some sort of cosmic difference in real life.
Root until snot runs out your nose. Do not root for one second. Same thing will happen if you root or not root for the Eagles or the Chiefs, which is nothing at all.
It is why I always wonder why anyone wants to root for any team other than their favorite? Rooting for your favorite team makes that someone happy. Does rooting for other teams make a person happy as well? Well. Strike that last question. Some people believe rooting creates wins and losses, lol.
Personally, I think rooting for Dallas alone, in every conceivable and non-conceivable situation, is enough to make a Cowboy fan happy. Just my two cents.