By default sudo gives just an error about "switch your device to R&D mode if you want to break your device". You have to install a separate gainroot package to do it without R&D mode. Anyone who does either of those should be experienced enough to realize what the consequences are.
Of course, allowing ALL users rather than just the normal "user" to get root privileges is worse. And yes, a quick look at /etc/sudoers does look as if any user could simply do that. But I just tried:
1. start xterm
2. sudo gainroot
3. su (some other user than "user")
4. sudo gainroot -> it asks for password!
5. su user
6. sudo gainroot -> it works (just as in step 2)
So the user named "user" apparently is checked in (all? of) those scripts that sudo is allowed to execute. It's perfect. Just what you'd expect.