These sites exist solely to generate ad revenue. They have no capability to view profiles. They use sensational headlines to lure clicks, force users to view multiple advertisements, and then display an error message claiming the target profile is "protected."
The short answer is generally no.
The Exception: The only "functioning" tools are those that search for cached (archived) versions of a public profile. If a user was previously public and later went private, search engines like Google may still hold a thumbnail of their profile picture in a cache. Tools that find this are not "hacking" the private profile; they are finding old public data. facebook profile private pictures unlocker viewer
Some tools require the user to download software or a browser extension. These sites exist solely to generate ad revenue
Curiosity makes us vulnerable. If you ever searched for a Facebook private picture viewer: The Exception: The only "functioning" tools are those