Yeah, but each individual, by themselves, cannot make any significant positive change by giving up huge cars, while doing so means giving up something they want. So the gain/loss tradeoff is not good on an individual level.

You can assign collective blame, but what good is that, except for virtue signalling and guilt tripping? It's not an effective method of social change.

There is an organization (government) that can make those changes that you want (ban huge cars) - so why not blame them for not doing it?