1st video rider low sided because of decreasing radius and he ran out of lean angle, pretty simple mistake.
2nd video, similar, but simply blew the turn and ran wide.
Both cases are crashes that should not have happened but the riders both carried to much entry speed and suffered the same low-side fate. Usually these happen because the rider doesn't know the road, it's a new bike, or they haven't ridden for awhile and have not relearned their limits.
Lets be real, sport bikes are designed to corner fast, brake fast, accelerate fast, and they are ridden in such a manner. The vast majority of sport bikers I have ridden with ride similar to these guys (maybe not quite as douchey), and the ones who don't are usually new riders.