Drawing on results discussed in the target article by Baumeister et al. (1), I argue that the claim that the modern mind sciences are discovering that free will is an illusion ("willusionism") is ambiguous and depends on how ordinary people understand free will. When interpreted in ways that the evidence does not justify, the willusionist claim can lead to 'bad results.' That is, telling people that free will is an illusion leads people to cheat more, help less, and behave more aggressively, but these responses may be based on people's interpreting willusionist claims to mean that they lack the powers of rational choice and self-control. ] are appropriately modest about what psychology can contribute to debates about free will, not because they don't have much to contribute to those debates-they do. Rather, they understand that it is not obvious how people do, or should, understand the concept of free will and that, in part because of this, scientific discoveries can inform debates about free will only to the extent that we are clear about which conception of free will is at issue. Baumeister et al. offer us a particular conception of free will that is naturalistic and useful. Useful because scientific discoveries about human decision-making and selfcontrol, such as those offered in the research they discuss, can help to explain how such free will works, what its limits are, and even how it might be developed. Many other scientists work with a conception of free will that is non-naturalistic. With that conception in mind, they suggest that scientific discoveries about human decision-making explain away free will, suggesting that it is an illusion.Rather than use Baumeister et al.'s article as a target of my criticisms, I will instead draw on its main points in order to develop some criticisms against these other scientists who suggest they are showing that free will is an illusion. By considering the different ways philosophers, scientists, and laypersons understand free will, we can see why such scientific claims about free will may have significant ethical and social ramifications.