Absolutely disgusting!
So: most, some, a few: these kind of a$$inine tourists and photo safaris tourists outfitters, who don't or do very little to contribute to conservation efforts for all wildlife, who don't approve of hunters, hunting, and the massive amount [we] contribute to conservation efforts of all wildlife, thinks this is okay or appropriate behavior to basically "crowd" animals to photograph (and/or watch/view) and other stupid sh:t as we have seen on social media sites, msm news, and posted on this site.
I don't have a problem with photo safaris or outfitters that exclusively or in addition to hunting safaris providing they operate in a respectful manner. Example being: restricting a (as in one, maybe, but no more than, two) vehicle(s) at one time to operate on a {relative term} schedule, and on a regular/ routine trail/ path/ (dirt/earthen) roadway that is less destructive to wildlife habitat and less intrusive to the natural behavior of wildlife.
I saw the videos referenced by the OP. The video referring to the wildebeest and zebra at the river crossing was a caos of vehicles filled with tourists rushing to get as close to the river crossing as they could, interfering so much so with the animals normal river crossing that the animals had to divert to a more dangerous part of the river bank and a deeper part of the croc infested area of the river to cross the waterway. The video showed animals having either a broken or badly injured leg after it had crossed the river and animals laying near the water too injured to make the crossing after falling or rolling down the steep river bank. The video also showed animals that had died trying to get down that same area of the near vertical river bank because tourist filled vehicles prevented them from going further down the river to find a better/easier crossing point.