At best it's "a root". As opposed to "the root". From history we learn there are so many roots in mankind's wild imagination of how to hate, kill, rape, destroy, and otherwise make others miserable.
But certainly at this time in our country, it would be a good argument as "the root", though we might prioritize choices 2-9 of a list limited to 10.
There are so many billionaire would-be saviors in our country as to make the commoner's head spin. And that's what they do in their corruption. It's part of their charm. We have a bunch of them here in wishy-Warshington, too!
I wouldn't disagree with an amendment idea, hoping something might work. Problem is, the billionaires simply change strategy with whatever happens. If one succumbs, another blossoms. But that doesn't mean our country shouldn't work against it.
As one says, "when it rains bring buckets", and he says that with glee!