Federal (income) taxes are used as a control mechanism to manipulate behavior. A consumption tax voids that control as we can shop for the best deals, lowering our tax liability and having little or no requirements to answer to the government. Federal income taxes can be used to affect aggregate demand, thereby expanding or contracting the economy, changing consumer/tax payer behavior. That control can be more firmly applied in the form of penalties if one cannot satisfy their federal tax obligation. IOW, that’s why the politicians hate the idea of a consumption tax. They can’t make us their b***.