Why? Because defending this freedom forces us to grapple with uncomfortable contradictions. I don't want to see Neo-Nazis protesting in a public area of my city, but I allow their right to speech because I don't want courts to set a precedent for banning speech about political issues.
I don't want underage children to view pictures of sexual violence, but I have to consider how blanket restrictions on sexual content will make it harder for adolescents to access information about safe sex and for adults to view legal pornography.
I think too many people expect speech-related issues to be simple and easy. They take a hard position because they feel uncomfortable with the ambiguity that comes with balancing our emotions with larger legal precedents.
The blanket bans on sexual content in the U.K. epitomize this: emotional concerns about "shielding" children from sexual content seem to have overshadowed more nuanced conversations about education and adults' freedom to access information.