The better approach (in this case) is to ask the same question 15-20 years later. The public support drops dramatically. And it’s not because of some “revisionist history” nonsense, either. The public just learns a few things about their government and their fellow Americans over time that they didn’t know when they were giving an impulsive answer at a time of national drama.
Isn’t asking someone’s opinion of any historic event, decades after it happened, vs. their opinion of that event right when it happened, a type of revisionist history?