> So you don't know what to endorse and what not

Surely that's the point of how endorsements should work? Do you know that this person is skilled in Fooing Bars? Then endorse them. Otherwise, don't.

If you don't know whether the site or the user added the skill, it suggests you don't know enough to endorse them for that particular skill.

> It's like the whole damn site was build to fool people around and to promote lying.

Agreed. I'm sure the whole endorsements system at least was built to generate spam and click-throughs. Fortunately, almost everyone recognises it for what it really is - a pointless click-fest with no real value in deciding which skills someone has.