Youtube actually does give posters of video's the capability to disable embedding to protect the member. Fortunately, most youtube users don't make video's they don't want people to see. The concern must remain on youtube's/ vimeo/ or insert video host part to ensure that members are aware that copyrighted material (music, graphics a.s.o.) remains protected. In the end, there are billions of cases which would need to be settled/ challenged and the government may end up hiring the soon to be 50 million unemployed people in our country to do all the enforcing on idiocy regulation and knee jerk government intervention. Monty Python would have a field day, if he was still with us. We are aiming hard and higher than the mighty Lord would have ever thought, to outperform the silliest of countries with idiocy and utter lack of common sense.
I guess everyone with half a brain realizes that embedding a video with "criminal" content (stolen property, pornographic content and other stuff) is not legal per se.
It would be up to legal definition to pursue and successfully punish a publisher (such as a forum owner, who is the publisher of all content on that site, even if not written by that person) for copyright violations which occur outside of his/ her domain. Even youtube could not be held fully responsible if challenged properly, because they essentially do not have control over what is uploaded prior to the fact.
The KY Jelly or Vaseline could be used either way, on those who embed the video's, or those who challenge them for doing so.
Short of flipping the master switch on the world wide web, there is absolutely NOTHING that will unhinge the power of the web...

Here, that web still works under Stars and Stripes - fortunately not yet under the Chinese flag.