To be fair, exposure does not usually imply complicity, unless you failed to report something in a situation where as a layman you could tell this is legally questionable.

That is, clicking on a link then downvoting might be enough for you in regards to handling it. Yeah, it would have been better to either never click on it or flat out report it (Youtube has now taken down the video, phew), but that goes beyond what someone just clicking on some link could reasonably be expected to do.