EIB0879 brings up a good point, one that should be brought up.
Who decides that these people are experts? Did you investigate any of the claims this person made? Do people think that a person making videos are experts in whatever field?
Case in point, Kentucky Ballistics and the 50 BMG Kaboom. 99% of the people that watched the video, blamed the weapon design. I've shot my friends RN-50 numerous times and have no issues.
The guy that runs the channel and puts the videos out, bought questionable ammo. He then proceeded to shoot the ammo and had a semi-predicable outcome.
The thing is, new people will watch people like him and the video posted. Unless they do more investigating, they will "think" these people are experts.