As a website owner, you want people to visit your site and make use of the information you provide. However, you also want to make sure that people using your site are using it appropriately and properly. Given your website is in the public domain, you should also ensure that you are properly protected from any potential liabilities or claims from people who are using your site.
The easiest way to achieve all this is to have clear and effective Website Terms and Conditions that set out what is expected of visitors to your site and also include various notices and disclaimers.