Maybe you were responding to "form herds, gang up, pile on". My explanation for why they do that: For a newsie, if some of the bigger guns in the MSM are saying that some candidate is a dirty rat, then it is both safe and easy for all the other newsies in the MSM to do the same. Just one newsie calling dirty rat likely won't have enough credibility to get much traction, but, if all the MSM newsies are saying dirty rat, then they all get credibility, not just for a claim of dirty rat but maybe also even for little green men from Mars. More generally, gangs offer to their members some safety of numbers, and people in gangs are more willing to throw stones.
A friend of mine who remembers NYC some decades ago explains that the NYT wrote the stories and the rest of the MSM, especially the TV evening news, just went along -- easy, "no real work about it".
Yes, no doubt much the same applied to tribes. If everyone joins in, then can bring down an elephant, mastodon, bison, reindeer or some such, no one member of the tribe is at much risk of injury, and everyone in the tribe eats that day. If some guy in the tribe just wants to sleep through the effort, then maybe the rest of the tribe won't let him eat!
