 The harm principle itself is complex in several ways. Harm to others is not a sufficient ground for restricting liberty. Rather, it creates a pro tanto reason for restricting liberty. Determination of whether restrictions on harmful conduct are fully justified depends on balancing the evils of regulation against the harm to be prevented. Moreover, it is not clear if the harm principle justifies restricting liberty to prevent others from being harmed or only justifies restricting liberty to prevent those whose liberty is being restricted from causing harm to another. The anti-harming rationale for restricting liberty is narrower than the harm-prevention rationale. Only the broader harm-prevention rationale would explain how Mill could hope to square Good Samaritan laws and laws compelling testimony in court with the harm principle. Because the harm-prevention principle is broader, it will justify greater restrictions on liberty than the anti-harming principle. It is also unclear whether the harm principle protects all liberty or just basic liberties. The harm principle is more robust if it targets restrictions on basic liberties, rather than liberty per se. But if we qualify the harm principle in these ways, we are very far from the common libertarian reading of the harm principle as limiting any and all liberty only to prevent force or fraud.