I think the easiest way to accelerate decarbonization is to make green tech more desirable independent of the greenness. If people want it, they’ll get it and in that sense SUVs could help achieve climate goals.
That being said, I'm not sure why you are being aggressively downvoted as your basic premise is correct. Most people are not going to buy an inferior vehicle (eg small, uncomfortable, slow, less capable, expensive, etc) just because it is green. I know people on HN might, and good for them for doing so, but that's not going to be the case more broadly. If we want mass adoption of green vehicles, either the vehicles have to be relatively on par quality wise with existing non-hybrid gas vehicles, there has to be social status attached to owning one (eg Tesla), there has to be a regulatory change, or the operating cost of gas vehicles has to go way up (ie fuel needs to be taxed aggressively) to cause operating costs to figure strongly in the buying decision.