The good samaritan is a law that enforces the obligation or give the right for internet service provider - ISP - or internet computer services - ICS- to publish the content of third party without expose itself to a penalty. Why that law !
The Section 230 of the Communications Act of 1934, enacted as part of the Communications Decency Act of 1996 - website of US Congress - provides limited federal immunity, the reasons are the 5 following :
1/ The rapidly developing array of Internet and other interactive computer services available to individual Americans represent an extraordinary advance in the availability of educational and informational resources to our citizens.
2/ These services offer users a great degree of control over the information that they receive, as well as the potential for even greater control in the future as technology develops.
3/ The Internet and other interactive computer services offer a forum for a true diversity of political discourse, unique opportunities for cultural development, and myriad avenues for intellectual activity.
4/ The Internet and other interactive computer services have flourished, to the benefit of all Americans, with a minimum of government regulation.
5/ Increasingly Americans are relying on interactive media for a variety of political, educational, cultural, and entertainment services.