Is it okay to inflict personal harm because it is “for the good of society”? While some forms of free speech lead to the development of society as a whole and the recognition of truths, other forms can be harmful to individuals. Mill addresses hate speech in On Liberty, which he calls the harm principle. This principle, Mill argues, is the only exception that limits free speech. However, when this topic was briefly examined in the conference on September 20, 2011, under the topic “Should harmful ideas be suppressed?” it has been said that Mill's theories state: who decides what is harmful and that the harm itself should be a matter of debate. Since the topic of personal harm is debated, some forms of hate speech may be considered acceptable. Perhaps, some forms can be allowed as long as they are not physically harmful, but still mental