To a certain extent, I agree that you need to hear opposing voices. At the same time, I look at those opposing voices under Bush from the left, and it looks like an insane asylum burst open and the patients had taken over left wing media outlets.
Very little of it was worth hearing. And most of it was downright scary, the lengths to which these people would out and out lie.
You touched on that poll at MSNBC 70% vs <50%. That poll wasn’t the only evidence of that. Their whole network bias operated on a basis that had a wider spread than that poll IMO.
They attacked Bush 24-7 for everything under the sun, especially once things started going wrong. The problem is when conservatives assumed that is proof he was doing right.
Every once in a while I would see something they hit on and say “That is going to stick” and it usually did.