According to a popular view, excuses undermine blameworthiness. At the same time, philosophers commonly accept that blameworthiness is composed of two necessary conditions: a moral objectionability condition and a responsibility condition. For excuses to do their job, they must undermine at least one of these conditions. In this paper, I conclude that excuses do neither. By inference to the best explanation, I propose a view that reconciles this conclusion with the function of excuses.