Your first link is to a video from Robert Lustig. You should probably have mentioned that his viewpoints are quite controversial, and there's hardly yet a scientific consensus on them.
You shouldn't post his videos as the gospel truth.
If I google about the term for a bit, I see no scientific rebuttals of his points in that video.
I mean, it's biochemistry, if he's that much wrong (he seems quite educated) then some of his science is also wrong; would you be so kind to provide few links of rebuttals to his research papers or whatever you are reading.
I would greatly appreciate if you stick to actual scientific papers, as I really don't have time to get dragged into the whole USA 'omg hes from <political party> and that's why he states his pro [trump/hilary] views.
TLDR: I honestly don't know about any controversies streaming from that video, but would like to read the scientific rebutals, if any, with respect to that guy's work.
Bottom line: fructose (50% of ordinary sugar) is not metabolized in the same way as glucose (the other 50%). The latter is used by just about every cell in the body whereas the liver is mainly responsible for handling fructose. This organ also metabolizes other things like alcohol and paracetamol. Overloading the liver is not a good idea. Anyone can read up on what 'overloading' means for any of those or other nutrients and go figure. None of this is controversial though the definition and effects of 'excess' fructose obviously are, for any individual.
You shouldn't post his videos as the gospel truth.