Using JavaScript and Visualforce pages to create remote site settings dynamically is not permitted due to security implications. Salesforce policy explicitly disallows dynamically modifying critical org settings, including remote site settings, through JavaScript or Visualforce. Such actions require the use of a connected app and must adhere to strict guidelines. Additionally, dynamically loading JavaScript from third-party endpoints is prohibited. Instead, JavaScript must be stored in static resources to ensure security and version control. Programmatically creating a Remote Site Setting from Apex is considered a security risk because it allows the app to specify arbitrary servers or schemes, which could lead to unauthorized or insecure connections. This practice bypasses the controlled configuration process, potentially exposing sensitive data or enabling malicious activities. It is essential to enforce HTTPS and ensure that endpoints are predefined and justified with a reasonable business case to mitigate such risks.