Naive question: When talking about taxes on the wealthy, the metrics people seem to really care about are employment rates and wages for people the wealthy emp

Naive question: When talking about taxes on the wealthy, the metrics people seem to really care about are employment rates and wages for people the wealthy employ. So why not increase tax rates on the wealthy significantly, close loopholes, and then introduce big tax credits for every head employed and every dollar spent on employee salaries? i.e. Instead of slashing taxes so the rich have more money and then hoping that they will spend it on their employees, incentivize the desired behaviour directly.