Obviously, but the argument has always been about whether we're to the left or the right of that point. Also, positing a single point is oversimplifying, since with a progressive tax code different earnings are taxed at different rates. There is nothing incorrect in principle with the Laffer Curve, but it's been abused (deliberately) but high earners and their puppets in government to evade taxation. We now have historically low taxes yet the economy is not spurred enough to offset the tremendous loss of revenue that the 34-year and counting tax holiday for the rich. Our debt is as much a revenue problem as a spending problem, and we have to attack both. The GOP showed it's true colors when every candidate in 2012 rejected a 10:1 revenue to expenditure solution.
Our government is being held hostage by a transnational 1% who view taxes as theft and government as their salaried personal assistant. Fix that and we have a hope of attacking systemic problems like debt. Don't fix it and any piecemeal solution you try will fail since it doesn't attack the fundamental issue.